diff --git a/config.mak.dev b/config.mak.dev
index 2d244ca470..bfbd3df4e8 100644
--- a/config.mak.dev
+++ b/config.mak.dev
@@ -2,6 +2,7 @@ ifeq ($(filter no-error,$(DEVOPTS)),)
 CFLAGS += -Werror
 endif
 CFLAGS += -Wdeclaration-after-statement
+CFLAGS += -Wformat-security
 CFLAGS += -Wno-format-zero-length
 CFLAGS += -Wold-style-definition
 CFLAGS += -Woverflow