diff --git a/video/sdl_v.c b/video/sdl_v.c
index f9b96f7eb3..93ff90bbca 100644
--- a/video/sdl_v.c
+++ b/video/sdl_v.c
@@ -440,7 +440,9 @@ static void SdlVideoMainLoop(void)
 
 			_ctrl_pressed = !!(mod & (KMOD_LCTRL | KMOD_RCTRL));
 			_shift_pressed = !!(mod & (KMOD_LSHIFT | KMOD_RSHIFT));
+#ifdef _DEBUG
 			_dbg_screen_rect = !!(mod & KMOD_CAPS);
+#endif
 
 			// determine which directional keys are down
 			_dirkeys =
diff --git a/video/win32_v.c b/video/win32_v.c
index 90997804a3..072077c6a6 100644
--- a/video/win32_v.c
+++ b/video/win32_v.c
@@ -734,7 +734,9 @@ static void Win32GdiMainLoop(void)
 			next_tick += 30;
 			_ctrl_pressed = _wnd.has_focus && GetAsyncKeyState(VK_CONTROL)<0;
 			_shift_pressed = _wnd.has_focus && GetAsyncKeyState(VK_SHIFT)<0;
+#ifdef _DEBUG
 			_dbg_screen_rect = _wnd.has_focus && GetAsyncKeyState(VK_CAPITAL)<0;
+#endif _DEBUG
 
 			// determine which directional keys are down
 			if (_wnd.has_focus) {