diff --git a/Makefile b/Makefile
index 7c0e20b5..8cd57ce9 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,7 @@ ifneq (,$(findstring yes,$(CAPSTONE_X86_ATT_DISABLE)))
 CFLAGS += -DCAPSTONE_X86_ATT_DISABLE
 endif
 
-CFLAGS += -fPIC -Wall -Wwrite-strings -Iinclude
+CFLAGS += -fPIC -Wall -Wwrite-strings -Wmissing-prototypes -Iinclude
 
 ifeq ($(CAPSTONE_USE_SYS_DYN_MEM),yes)
 CFLAGS += -DCAPSTONE_USE_SYS_DYN_MEM