diff --git a/mrblib/xkremap/key_remap_compiler.rb b/mrblib/xkremap/key_remap_compiler.rb
index 521c8b8..f2d689b 100644
--- a/mrblib/xkremap/key_remap_compiler.rb
+++ b/mrblib/xkremap/key_remap_compiler.rb
@@ -18,8 +18,8 @@ module Xkremap
       display = @display
 
       # C-b -> Left
-      result[to_keycode(X11::XK_b)][1<<2] = Proc.new do
-        XlibWrapper.input_key(display, 0xff51, 0)
+      result[to_keycode(X11::XK_b)][X11::ControlMask] = Proc.new do
+        XlibWrapper.input_key(display, X11::XK_Left, X11::NoModifier)
       end
     end
 
diff --git a/src/x11_constants.c b/src/x11_constants.c
index 1846e60..4ef885e 100644
--- a/src/x11_constants.c
+++ b/src/x11_constants.c
@@ -1,4 +1,5 @@
 #include <X11/keysym.h>
+#include <X11/X.h>
 #include "mruby.h"
 
 void
@@ -7,7 +8,10 @@ mrb_xkremap_x11_constants_init(mrb_state *mrb, struct RClass *mXkremap)
   struct RClass *mX11 = mrb_define_module_under(mrb, mXkremap, "X11");
 # define define_x11_const(name) mrb_define_const(mrb, mX11, #name, mrb_fixnum_value(name))
 
-  // cat /usr/include/X11/keysymdef.h| ruby -e 'puts STDIN.read.split("\n").select {|l| l.match(/\A(#define XK_|#ifdef|#endif)/) }.map{|l| l.match(/\A#define XK_/) ? %Q[  define_x11_const(#{l.split(" ")[1]});] : l }.join("\n")'
+  // original constant.
+  mrb_define_const(mrb, mX11, "NoModifier", mrb_fixnum_value(0));
+
+  // cat /usr/include/X11/keysymdef.h | ruby -e 'puts STDIN.read.split("\n").select {|l| l.match(/\A(#define XK_|#ifdef|#endif)/) }.map{|l| l.match(/\A#define XK_/) ? %Q[  define_x11_const(#{l.split(" ")[1]});] : l }.join("\n")'
   define_x11_const(XK_VoidSymbol);
 #ifdef XK_MISCELLANY
   define_x11_const(XK_BackSpace);
@@ -2163,4 +2167,381 @@ mrb_xkremap_x11_constants_init(mrb_state *mrb, struct RClass *mXkremap)
   define_x11_const(XK_Sinh_luu2);
   define_x11_const(XK_Sinh_kunddaliya);
 #endif /* XK_SINHALA */
+
+  // cat /usr/include/X11/X.h | ruby -e 'puts STDIN.read.split("\n").select {|l| l.start_with?("#")}[2..-2].map{|l| l.start_with?("#define") ? %Q[  define_x11_const(#{l.split(" ")[1]});] : l}'
+  define_x11_const(X_PROTOCOL);
+  define_x11_const(X_PROTOCOL_REVISION);
+#ifndef _XSERVER64
+#  ifndef _XTYPEDEF_XID
+#    define _XTYPEDEF_XID
+#  endif
+#  ifndef _XTYPEDEF_MASK
+#    define _XTYPEDEF_MASK
+#  endif
+#  ifndef _XTYPEDEF_ATOM
+#    define _XTYPEDEF_ATOM
+#  endif
+#else
+#  include <X11/Xmd.h>
+#  ifndef _XTYPEDEF_XID
+#    define _XTYPEDEF_XID
+#  endif
+#  ifndef _XTYPEDEF_MASK
+#    define _XTYPEDEF_MASK
+#  endif
+#  ifndef _XTYPEDEF_ATOM
+#    define _XTYPEDEF_ATOM
+#  endif
+#endif
+#ifndef _XTYPEDEF_FONT
+#  define _XTYPEDEF_FONT
+#endif
+#ifndef None
+  define_x11_const(None);
+#endif
+  define_x11_const(ParentRelative);
+  define_x11_const(CopyFromParent);
+  define_x11_const(PointerWindow);
+  define_x11_const(InputFocus);
+  define_x11_const(PointerRoot);
+  define_x11_const(AnyPropertyType);
+  define_x11_const(AnyKey);
+  define_x11_const(AnyButton);
+  define_x11_const(AllTemporary);
+  define_x11_const(CurrentTime);
+  define_x11_const(NoSymbol);
+  define_x11_const(NoEventMask);
+  define_x11_const(KeyPressMask);
+  define_x11_const(KeyReleaseMask);
+  define_x11_const(ButtonPressMask);
+  define_x11_const(ButtonReleaseMask);
+  define_x11_const(EnterWindowMask);
+  define_x11_const(LeaveWindowMask);
+  define_x11_const(PointerMotionMask);
+  define_x11_const(PointerMotionHintMask);
+  define_x11_const(Button1MotionMask);
+  define_x11_const(Button2MotionMask);
+  define_x11_const(Button3MotionMask);
+  define_x11_const(Button4MotionMask);
+  define_x11_const(Button5MotionMask);
+  define_x11_const(ButtonMotionMask);
+  define_x11_const(KeymapStateMask);
+  define_x11_const(ExposureMask);
+  define_x11_const(VisibilityChangeMask);
+  define_x11_const(StructureNotifyMask);
+  define_x11_const(ResizeRedirectMask);
+  define_x11_const(SubstructureNotifyMask);
+  define_x11_const(SubstructureRedirectMask);
+  define_x11_const(FocusChangeMask);
+  define_x11_const(PropertyChangeMask);
+  define_x11_const(ColormapChangeMask);
+  define_x11_const(OwnerGrabButtonMask);
+  define_x11_const(KeyPress);
+  define_x11_const(KeyRelease);
+  define_x11_const(ButtonPress);
+  define_x11_const(ButtonRelease);
+  define_x11_const(MotionNotify);
+  define_x11_const(EnterNotify);
+  define_x11_const(LeaveNotify);
+  define_x11_const(FocusIn);
+  define_x11_const(FocusOut);
+  define_x11_const(KeymapNotify);
+  define_x11_const(Expose);
+  define_x11_const(GraphicsExpose);
+  define_x11_const(NoExpose);
+  define_x11_const(VisibilityNotify);
+  define_x11_const(CreateNotify);
+  define_x11_const(DestroyNotify);
+  define_x11_const(UnmapNotify);
+  define_x11_const(MapNotify);
+  define_x11_const(MapRequest);
+  define_x11_const(ReparentNotify);
+  define_x11_const(ConfigureNotify);
+  define_x11_const(ConfigureRequest);
+  define_x11_const(GravityNotify);
+  define_x11_const(ResizeRequest);
+  define_x11_const(CirculateNotify);
+  define_x11_const(CirculateRequest);
+  define_x11_const(PropertyNotify);
+  define_x11_const(SelectionClear);
+  define_x11_const(SelectionRequest);
+  define_x11_const(SelectionNotify);
+  define_x11_const(ColormapNotify);
+  define_x11_const(ClientMessage);
+  define_x11_const(MappingNotify);
+  define_x11_const(GenericEvent);
+  define_x11_const(LASTEvent);
+  define_x11_const(ShiftMask);
+  define_x11_const(LockMask);
+  define_x11_const(ControlMask);
+  define_x11_const(Mod1Mask);
+  define_x11_const(Mod2Mask);
+  define_x11_const(Mod3Mask);
+  define_x11_const(Mod4Mask);
+  define_x11_const(Mod5Mask);
+  define_x11_const(ShiftMapIndex);
+  define_x11_const(LockMapIndex);
+  define_x11_const(ControlMapIndex);
+  define_x11_const(Mod1MapIndex);
+  define_x11_const(Mod2MapIndex);
+  define_x11_const(Mod3MapIndex);
+  define_x11_const(Mod4MapIndex);
+  define_x11_const(Mod5MapIndex);
+  define_x11_const(Button1Mask);
+  define_x11_const(Button2Mask);
+  define_x11_const(Button3Mask);
+  define_x11_const(Button4Mask);
+  define_x11_const(Button5Mask);
+  define_x11_const(AnyModifier);
+  define_x11_const(Button1);
+  define_x11_const(Button2);
+  define_x11_const(Button3);
+  define_x11_const(Button4);
+  define_x11_const(Button5);
+  define_x11_const(NotifyNormal);
+  define_x11_const(NotifyGrab);
+  define_x11_const(NotifyUngrab);
+  define_x11_const(NotifyWhileGrabbed);
+  define_x11_const(NotifyHint);
+  define_x11_const(NotifyAncestor);
+  define_x11_const(NotifyVirtual);
+  define_x11_const(NotifyInferior);
+  define_x11_const(NotifyNonlinear);
+  define_x11_const(NotifyNonlinearVirtual);
+  define_x11_const(NotifyPointer);
+  define_x11_const(NotifyPointerRoot);
+  define_x11_const(NotifyDetailNone);
+  define_x11_const(VisibilityUnobscured);
+  define_x11_const(VisibilityPartiallyObscured);
+  define_x11_const(VisibilityFullyObscured);
+  define_x11_const(PlaceOnTop);
+  define_x11_const(PlaceOnBottom);
+  define_x11_const(FamilyInternet);
+  define_x11_const(FamilyDECnet);
+  define_x11_const(FamilyChaos);
+  define_x11_const(FamilyInternet6);
+  define_x11_const(FamilyServerInterpreted);
+  define_x11_const(PropertyNewValue);
+  define_x11_const(PropertyDelete);
+  define_x11_const(ColormapUninstalled);
+  define_x11_const(ColormapInstalled);
+  define_x11_const(GrabModeSync);
+  define_x11_const(GrabModeAsync);
+  define_x11_const(GrabSuccess);
+  define_x11_const(AlreadyGrabbed);
+  define_x11_const(GrabInvalidTime);
+  define_x11_const(GrabNotViewable);
+  define_x11_const(GrabFrozen);
+  define_x11_const(AsyncPointer);
+  define_x11_const(SyncPointer);
+  define_x11_const(ReplayPointer);
+  define_x11_const(AsyncKeyboard);
+  define_x11_const(SyncKeyboard);
+  define_x11_const(ReplayKeyboard);
+  define_x11_const(AsyncBoth);
+  define_x11_const(SyncBoth);
+  define_x11_const(RevertToNone);
+  define_x11_const(RevertToPointerRoot);
+  define_x11_const(RevertToParent);
+  define_x11_const(Success);
+  define_x11_const(BadRequest);
+  define_x11_const(BadValue);
+  define_x11_const(BadWindow);
+  define_x11_const(BadPixmap);
+  define_x11_const(BadAtom);
+  define_x11_const(BadCursor);
+  define_x11_const(BadFont);
+  define_x11_const(BadMatch);
+  define_x11_const(BadDrawable);
+  define_x11_const(BadAccess);
+  define_x11_const(BadAlloc);
+  define_x11_const(BadColor);
+  define_x11_const(BadGC);
+  define_x11_const(BadIDChoice);
+  define_x11_const(BadName);
+  define_x11_const(BadLength);
+  define_x11_const(BadImplementation);
+  define_x11_const(FirstExtensionError);
+  define_x11_const(LastExtensionError);
+  define_x11_const(InputOutput);
+  define_x11_const(InputOnly);
+  define_x11_const(CWBackPixmap);
+  define_x11_const(CWBackPixel);
+  define_x11_const(CWBorderPixmap);
+  define_x11_const(CWBorderPixel);
+  define_x11_const(CWBitGravity);
+  define_x11_const(CWWinGravity);
+  define_x11_const(CWBackingStore);
+  define_x11_const(CWBackingPlanes);
+  define_x11_const(CWBackingPixel);
+  define_x11_const(CWOverrideRedirect);
+  define_x11_const(CWSaveUnder);
+  define_x11_const(CWEventMask);
+  define_x11_const(CWDontPropagate);
+  define_x11_const(CWColormap);
+  define_x11_const(CWCursor);
+  define_x11_const(CWX);
+  define_x11_const(CWY);
+  define_x11_const(CWWidth);
+  define_x11_const(CWHeight);
+  define_x11_const(CWBorderWidth);
+  define_x11_const(CWSibling);
+  define_x11_const(CWStackMode);
+  define_x11_const(ForgetGravity);
+  define_x11_const(NorthWestGravity);
+  define_x11_const(NorthGravity);
+  define_x11_const(NorthEastGravity);
+  define_x11_const(WestGravity);
+  define_x11_const(CenterGravity);
+  define_x11_const(EastGravity);
+  define_x11_const(SouthWestGravity);
+  define_x11_const(SouthGravity);
+  define_x11_const(SouthEastGravity);
+  define_x11_const(StaticGravity);
+  define_x11_const(UnmapGravity);
+  define_x11_const(NotUseful);
+  define_x11_const(WhenMapped);
+  define_x11_const(Always);
+  define_x11_const(IsUnmapped);
+  define_x11_const(IsUnviewable);
+  define_x11_const(IsViewable);
+  define_x11_const(SetModeInsert);
+  define_x11_const(SetModeDelete);
+  define_x11_const(DestroyAll);
+  define_x11_const(RetainPermanent);
+  define_x11_const(RetainTemporary);
+  define_x11_const(Above);
+  define_x11_const(Below);
+  define_x11_const(TopIf);
+  define_x11_const(BottomIf);
+  define_x11_const(Opposite);
+  define_x11_const(RaiseLowest);
+  define_x11_const(LowerHighest);
+  define_x11_const(PropModeReplace);
+  define_x11_const(PropModePrepend);
+  define_x11_const(PropModeAppend);
+  define_x11_const(GXclear);
+  define_x11_const(GXand);
+  define_x11_const(GXandReverse);
+  define_x11_const(GXcopy);
+  define_x11_const(GXandInverted);
+  define_x11_const(GXnoop);
+  define_x11_const(GXxor);
+  define_x11_const(GXor);
+  define_x11_const(GXnor);
+  define_x11_const(GXequiv);
+  define_x11_const(GXinvert);
+  define_x11_const(GXorReverse);
+  define_x11_const(GXcopyInverted);
+  define_x11_const(GXorInverted);
+  define_x11_const(GXnand);
+  define_x11_const(GXset);
+  define_x11_const(LineSolid);
+  define_x11_const(LineOnOffDash);
+  define_x11_const(LineDoubleDash);
+  define_x11_const(CapNotLast);
+  define_x11_const(CapButt);
+  define_x11_const(CapRound);
+  define_x11_const(CapProjecting);
+  define_x11_const(JoinMiter);
+  define_x11_const(JoinRound);
+  define_x11_const(JoinBevel);
+  define_x11_const(FillSolid);
+  define_x11_const(FillTiled);
+  define_x11_const(FillStippled);
+  define_x11_const(FillOpaqueStippled);
+  define_x11_const(EvenOddRule);
+  define_x11_const(WindingRule);
+  define_x11_const(ClipByChildren);
+  define_x11_const(IncludeInferiors);
+  define_x11_const(Unsorted);
+  define_x11_const(YSorted);
+  define_x11_const(YXSorted);
+  define_x11_const(YXBanded);
+  define_x11_const(CoordModeOrigin);
+  define_x11_const(CoordModePrevious);
+  define_x11_const(Complex);
+  define_x11_const(Nonconvex);
+  define_x11_const(Convex);
+  define_x11_const(ArcChord);
+  define_x11_const(ArcPieSlice);
+  define_x11_const(GCFunction);
+  define_x11_const(GCPlaneMask);
+  define_x11_const(GCForeground);
+  define_x11_const(GCBackground);
+  define_x11_const(GCLineWidth);
+  define_x11_const(GCLineStyle);
+  define_x11_const(GCCapStyle);
+  define_x11_const(GCJoinStyle);
+  define_x11_const(GCFillStyle);
+  define_x11_const(GCFillRule);
+  define_x11_const(GCTile);
+  define_x11_const(GCStipple);
+  define_x11_const(GCTileStipXOrigin);
+  define_x11_const(GCTileStipYOrigin);
+  define_x11_const(GCFont);
+  define_x11_const(GCSubwindowMode);
+  define_x11_const(GCGraphicsExposures);
+  define_x11_const(GCClipXOrigin);
+  define_x11_const(GCClipYOrigin);
+  define_x11_const(GCClipMask);
+  define_x11_const(GCDashOffset);
+  define_x11_const(GCDashList);
+  define_x11_const(GCArcMode);
+  define_x11_const(GCLastBit);
+  define_x11_const(FontLeftToRight);
+  define_x11_const(FontRightToLeft);
+  define_x11_const(FontChange);
+  define_x11_const(XYBitmap);
+  define_x11_const(XYPixmap);
+  define_x11_const(ZPixmap);
+  define_x11_const(AllocNone);
+  define_x11_const(AllocAll);
+  define_x11_const(DoRed);
+  define_x11_const(DoGreen);
+  define_x11_const(DoBlue);
+  define_x11_const(CursorShape);
+  define_x11_const(TileShape);
+  define_x11_const(StippleShape);
+  define_x11_const(AutoRepeatModeOff);
+  define_x11_const(AutoRepeatModeOn);
+  define_x11_const(AutoRepeatModeDefault);
+  define_x11_const(LedModeOff);
+  define_x11_const(LedModeOn);
+  define_x11_const(KBKeyClickPercent);
+  define_x11_const(KBBellPercent);
+  define_x11_const(KBBellPitch);
+  define_x11_const(KBBellDuration);
+  define_x11_const(KBLed);
+  define_x11_const(KBLedMode);
+  define_x11_const(KBKey);
+  define_x11_const(KBAutoRepeatMode);
+  define_x11_const(MappingSuccess);
+  define_x11_const(MappingBusy);
+  define_x11_const(MappingFailed);
+  define_x11_const(MappingModifier);
+  define_x11_const(MappingKeyboard);
+  define_x11_const(MappingPointer);
+  define_x11_const(DontPreferBlanking);
+  define_x11_const(PreferBlanking);
+  define_x11_const(DefaultBlanking);
+  define_x11_const(DisableScreenSaver);
+  define_x11_const(DisableScreenInterval);
+  define_x11_const(DontAllowExposures);
+  define_x11_const(AllowExposures);
+  define_x11_const(DefaultExposures);
+  define_x11_const(ScreenSaverReset);
+  define_x11_const(ScreenSaverActive);
+  define_x11_const(HostInsert);
+  define_x11_const(HostDelete);
+  define_x11_const(EnableAccess);
+  define_x11_const(DisableAccess);
+  define_x11_const(StaticGray);
+  define_x11_const(GrayScale);
+  define_x11_const(StaticColor);
+  define_x11_const(PseudoColor);
+  define_x11_const(TrueColor);
+  define_x11_const(DirectColor);
+  define_x11_const(LSBFirst);
+  define_x11_const(MSBFirst);
 }