diff --git a/util/cbmem/Makefile b/util/cbmem/Makefile
index e7318a17d4..485955b68a 100644
--- a/util/cbmem/Makefile
+++ b/util/cbmem/Makefile
@@ -19,7 +19,7 @@ CC       ?= $(CROSS_COMPILE)gcc
 INSTALL  ?= /usr/bin/env install
 PREFIX   ?= /usr/local
 CFLAGS   ?= -O2
-CFLAGS   += -Wall -Wextra -Werror
+CFLAGS   += -Wall -Wextra -Wmissing-prototypes -Werror
 CPPFLAGS += -I . -I $(ROOT)/commonlib/include
 CPPFLAGS += -include ../../src/commonlib/include/commonlib/compiler.h