diff --git a/make/defs.mk b/make/defs.mk
index c7a1a9f8..a88d70b0 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -259,6 +259,7 @@ GCC_REV                = $(shell  gcc -v 2>&1 | grep "gcc version" | awk '{ spli
 
 ifneq ($(GCC_VERSION),4.1.0)
 ifneq ($(GCC_VERSION),4.5.1)
+#BUILD_CFLAGS          += -std=c99
 BUILD_CPPFLAGS        += -std=c++11
 endif
 endif