diff --git a/src/tools/Makefile.am b/src/tools/Makefile.am
index 9d55a1f6..fe825719 100644
--- a/src/tools/Makefile.am
+++ b/src/tools/Makefile.am
@@ -2,7 +2,7 @@
 all-local: bin2c$(BUILD_EXEEXT)
 
 bin2c$(BUILD_EXEEXT): bin2c.c
-	$(AM_V_CC) $(CC_FOR_BUILD) $(CPPFLAGS) $(LDFLAGS) -g3 -o $@ $? -lz
+	$(AM_V_CC) $(CC_FOR_BUILD) $(CPPFLAGS_FOR_BUILD) $(LDFLAGS_FOR_BUILD) -g3 -o $@ $? -lz
 
 EXTRA_DIST = \
 	bin2c.c