diff --git a/Makefile b/Makefile
index a746940..ee6f298 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@
 .PHONY: docker-destroy
 .PHONY: docker-run
 .PHONY: archive
+.PHONY: js
 
 JS_FILE = assets/js/all.js
 CONTAINER = miniflux
@@ -21,11 +22,16 @@ docker-destroy:
 docker-run:
 	@ docker run --rm --name $(CONTAINER) -P $(IMAGE):$(TAG)
 
-js:
-	@ rm -f ${JS_FILE}
-	@ echo "/* AUTO GENERATED FILE, DO NOT MODIFY THIS FILE, USE 'make js' */" > ${JS_FILE}
-	@ cat assets/js/app.js assets/js/feed.js assets/js/item.js assets/js/event.js assets/js/nav.js >> ${JS_FILE}
-	@ echo "Miniflux.App.Run();" >> ${JS_FILE}
+js: $(JS_FILE)
+
+$(JS_FILE): assets/js/app.js \
+    assets/js/feed.js \
+    assets/js/item.js \
+    assets/js/event.js \
+    assets/js/nav.js
+	@ echo "/* AUTO GENERATED FILE, DO NOT MODIFY THIS FILE, USE 'make js' */" > $@
+	@ cat $^ >> $@
+	@ echo "Miniflux.App.Run();" >> $@
 
 # Build a new archive: make archive version=1.2.3 dst=/tmp
 archive: