diff --git a/tools/Makefile b/tools/Makefile
index 081383d..d377d85 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -254,7 +254,8 @@
 		-I$(srctree)/tools \
 		-DUSE_HOSTCC \
 		-D__KERNEL_STRICT_NAMES \
-		-D_GNU_SOURCE
+		-D_GNU_SOURCE \
+		-std=gnu99
 
 __build:	$(LOGO-y)