diff --git a/package.json b/package.json
index 50ed8a44..cdca422e 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,9 @@
     "*.min.js",
     "*.min.js.map"
   ],
+  "dependencies": {
+    "math-expression-evaluator": "^1.2.17"
+  },
   "devDependencies": {
     "mocha": "1.21.4",
     "chai": "^1.9.1",
@@ -36,7 +39,6 @@
     "karma-sauce-launcher": "~0.2.3",
     "grunt-checkrepo": "~0.1.0",
     "grunt-saucelabs": "~4.0.2",
-    "grunt-checkrepo": "~0.1.0",
     "grunt-git-status": "~1.0.0",
     "grunt-template": "~0.2.3",
     "source-map": "~0.1.40"
diff --git a/src/dimension-handler.js b/src/dimension-handler.js
index f1b263d1..96f83d06 100644
--- a/src/dimension-handler.js
+++ b/src/dimension-handler.js
@@ -14,6 +14,8 @@
 
 (function(scope, testing) {
 
+  var mexp = require('math-expression-evaluator');
+
   function parseDimension(unitRegExp, string) {
     string = string.trim().toLowerCase();
 
@@ -54,7 +56,7 @@
       return;
 
     for (var unit in matchedUnits) {
-      var result = eval(string.replace(new RegExp('U' + unit, 'g'), '').replace(new RegExp(taggedUnitRegExp, 'g'), '*0'));
+      var result = mexp.eval(string.replace(new RegExp('U' + unit, 'g'), '').replace(new RegExp(taggedUnitRegExp, 'g'), '*0'));
       if (!isFinite(result))
         return;
       matchedUnits[unit] = result;