diff --git a/package.json b/package.json
index e04032d785b..dc91bb8822d 100644
--- a/package.json
+++ b/package.json
@@ -42,11 +42,9 @@
     "sinon": "^1.15.4",
     "st": "^1.0.0",
     "through": "^2.3.7",
+    "gl": "^2.1.5",
     "watchify": "^3.2.2"
   },
-  "optionalDependencies": {
-    "gl": "^2.1.5"
-  },
   "browserify": {
     "transform": [
       "envify",