diff --git a/kpatch-build/Makefile b/kpatch-build/Makefile
index bebf3cd9..1ea9c50f 100644
--- a/kpatch-build/Makefile
+++ b/kpatch-build/Makefile
@@ -1,6 +1,6 @@
 include ../Makefile.inc
 
-CFLAGS += -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare \
+CFLAGS += -std=gnu11 -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare \
 	  -Wconversion -Wno-sign-conversion -g -Werror
 LDLIBS = -lelf