diff --git a/Makefile b/Makefile
index 1e430f3..2fa60d4 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ options:
 	@echo CC $<
 	@${CC} -c ${CFLAGS} $<
 
-${OBJ}: dmenu.h config.h
+${OBJ}: dmenu.h config.h config.mk
 
 config.h:
 	@echo creating $@ from config.default.h