diff --git a/libtommath/makefile_include.mk b/libtommath/makefile_include.mk
index 711b6301e..f3ceb9c1a 100644
--- a/libtommath/makefile_include.mk
+++ b/libtommath/makefile_include.mk
@@ -104,7 +104,7 @@ LIBTOOLFLAGS += -no-undefined
 endif
 
 # add in the standard FLAGS
-LTM_CFLAGS += $(CFLAGS)
+LTM_CFLAGS := $(CFLAGS) $(LTM_CFLAGS)
 LTM_LFLAGS += $(LFLAGS)
 LTM_LDFLAGS += $(LDFLAGS)
 LTM_LIBTOOLFLAGS += $(LIBTOOLFLAGS)