diff --git a/Makefile b/Makefile
index e495ca8..b2b38b9 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ clean:
 	rm -f $(WLR_PROTOCOL_IMPL)
 	rm -f $(WLR_PROTOCOL_HEADER)
 
-$(OUT): $(WLR_PROTOCOL_IMPL) $(WLR_PROTOCOL_HEADER)
+$(OUT): $(WLR_PROTOCOL_IMPL) $(WLR_PROTOCOL_HEADER) $(SRC)
 	$(CC) $(WLR_PROTOCOL_IMPL) $(SRC) $(CFLAGS) -o $(OUT)
 
 $(WLR_PROTOCOL_IMPL):