diff --git a/make/defs.mk b/make/defs.mk
index 564c1d77..91469d31 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -272,7 +272,7 @@ CLANG_CPPFLAGS            += -Wno-unused-private-field -Wno-self-assign-field -W
 
 ifneq ($(GCC_VERSION),4.1.0)
 ifneq ($(GCC_VERSION),4.5.1)
-BUILD_CFLAGS          += -std=c99
+BUILD_CFLAGS          += -std=gnu99
 BUILD_CPPFLAGS        += -std=c++11
 endif
 endif