diff --git a/makefile b/makefile
index dd51f94..9282b29 100644
--- a/makefile
+++ b/makefile
@@ -12,18 +12,16 @@ test : node_modules/jasmine/bin/jasmine.js
 	@node node_modules/jasmine/bin/jasmine.js spec/Spec.js
 prod-build :
 	@mkdir prod-build
-dist : prod-build
+prod-build/dist : prod-build
 	@mkdir prod-build/dist
-src : prod-build
-	@mkdir prod-build/src
-prod : node_modules/uglify-es/bin/uglifyjs prod-build src dist
+prod : node_modules/uglify-es/bin/uglifyjs prod-build prod-build/dist
 	@printf "Building Production version in prod-build...\n"
 	@node_modules/uglify-es/bin/uglifyjs -b -o prod-build/dist/differentia.js src/differentia.js
 	@node_modules/uglify-es/bin/uglifyjs -o prod-build/dist/differentia.min.js src/differentia.js
-	@cp src/differentia.js prod-build/src/differentia.js
 	@cp package.json prod-build/package.json
 	@cp README.md prod-build/README.md
-	@cp spec prod-build/spec
+	@cp -r src prod-build/src
+	@cp -r spec prod-build/spec
 	@printf "Done! ･ω･\n"
 clean :
 	@printf "Cleaning up...\n"
diff --git a/package.json b/package.json
index 9cf27e7..4140c70 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,13 @@
   "bugs": {
     "url": "https://github.com/Floofies/Differentia.js/issues"
   },
+  "devDependencies": {
+    "jasmine": "^2.8.0",
+    "uglify-es": "github:mishoo/UglifyJS2#harmony"
+  },
+  "scripts": {
+    "test": "jasmine spec/Spec.js"
+  },
   "main": "dist/differentia.js",
   "author": "Dani Glore",
   "license": "MIT"