diff --git a/Makefile b/Makefile
index d483302..debdd61 100644
--- a/Makefile
+++ b/Makefile
@@ -363,8 +363,8 @@
 
 HOSTCC       = gcc
 HOSTCXX      = g++
-KBUILD_HOSTCFLAGS   := -Wall -Wstrict-prototypes -O2 \
-		-fomit-frame-pointer $(HOST_LFS_CFLAGS) \
+KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
+		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 		$(HOSTCFLAGS)
 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)