diff --git a/Makefile b/Makefile
index e21be91..fd6217d 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ $(BUILD_DIR):
 	mkdir -p $(BUILD_DIR)
 
 # Resources
-$(BUILD_DIR)/resource.c: ui/ginput.gresource.xml ui/style.css ui
+$(BUILD_DIR)/resource.c: ui/ginput.gresource.xml ui/style.css $(UI)
 	cp ui/style.css $(BUILD_DIR)/
 	cd ui && glib-compile-resources --generate-source --target=resource.c ginput.gresource.xml
 	mv ui/resource.c $(BUILD_DIR)/