diff --git a/devel/unifdef/Makefile b/devel/unifdef/Makefile
index a0eceef35f..2dc499d15b 100644
--- a/devel/unifdef/Makefile
+++ b/devel/unifdef/Makefile
@@ -17,6 +17,9 @@ HOST_BUILD_PARALLEL:=1
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/host-build.mk
 
+HOST_CFLAGS += -std=gnu17
+TARGET_CFLAGS += -std=gnu17
+
 define Package/unifdef
   SECTION:=devel
   CATEGORY:=Development