diff --git a/package.json b/package.json
index 83bc36dd..3e5c855d 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,7 @@
     "three": "^0.83.0",
     "video.js": "^6.2.0",
     "webvr-boilerplate": "^0.5.0",
-    "webvr-polyfill": "^0.9.23"
+    "webvr-polyfill": "0.9.23"
   },
   "devDependencies": {
     "babel-plugin-external-helpers": "^6.22.0",
@@ -112,8 +112,8 @@
     "karma-qunit": "^1.2.1",
     "karma-safari-launcher": "^1.0.0",
     "mkdirp": "^0.5.1",
-    "node-static": "^0.7.9",
     "node-sass": "^4.5.3",
+    "node-static": "^0.7.9",
     "npm-run-all": "^4.0.2",
     "qunitjs": "^1.21.0",
     "rimraf": "^2.6.1",
@@ -123,6 +123,7 @@
     "rollup-plugin-json": "^2.1.1",
     "rollup-plugin-multi-entry": "^2.0.1",
     "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-replace": "^1.1.1",
     "rollup-watch": "^3.2.2",
     "semver": "^5.3.0",
     "sinon": "^2.2.0",
diff --git a/scripts/test.rollup.config.js b/scripts/test.rollup.config.js
index 946e17cf..7306ed7c 100644
--- a/scripts/test.rollup.config.js
+++ b/scripts/test.rollup.config.js
@@ -8,6 +8,7 @@ import commonjs from 'rollup-plugin-commonjs';
 import json from 'rollup-plugin-json';
 import multiEntry from 'rollup-plugin-multi-entry';
 import resolve from 'rollup-plugin-node-resolve';
+import replace from 'rollup-plugin-replace';
 
 export default {
   moduleName: 'videojsVrTests',
@@ -36,6 +37,7 @@ export default {
       jsnext: true
     }),
     json(),
+    replace({'mat4_invert =': 'var mat4_invert ='}),
     commonjs({
       sourceMap: false
     }),
diff --git a/scripts/umd.rollup.config.js b/scripts/umd.rollup.config.js
index 4a8751a2..9c42b8fd 100644
--- a/scripts/umd.rollup.config.js
+++ b/scripts/umd.rollup.config.js
@@ -8,6 +8,7 @@ import babel from 'rollup-plugin-babel';
 import commonjs from 'rollup-plugin-commonjs';
 import json from 'rollup-plugin-json';
 import resolve from 'rollup-plugin-node-resolve';
+import replace from 'rollup-plugin-replace';
 
 export default {
   moduleName: 'videojsVr',
@@ -25,6 +26,7 @@ export default {
       jsnext: true
     }),
     json(),
+    replace({'mat4_invert =': 'var mat4_invert ='}),
     commonjs({
       sourceMap: false
     }),