diff --git a/Makefile b/Makefile
index 83f74c1..000f0bb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,18 @@
-all: | build
-prod: | build validate
+all: build
+build: data/songs.json
+prod: build validate
 
-build:
+# TODO: Move to dist/
+
+lib_js = $(shell find lib -name '*.js' -type f)
+data/songs.json: data/songs.js $(lib_js)
 	node lib/build.js
+
 validate:
 	ajv -s data/schema.yaml -d data/songs.json --strict=false
+
 links:
 	lib/sh/getlatest.sh $(i)
+
 dbg:
 	node -e 'console.debug(require("util").inspect(require("./data/songs.js"), { colors: true, depth: Infinity, maxArrayLength: Infinity }))'