diff --git a/lib/stripped-build-plugins.js b/lib/stripped-build-plugins.js
index 0376c36e2d4..24e0141bd2b 100644
--- a/lib/stripped-build-plugins.js
+++ b/lib/stripped-build-plugins.js
@@ -4,10 +4,21 @@ var filterImports = require('babel-plugin-filter-imports');
 var featureFlags  = require('babel-plugin-feature-flags');
 var stripHeimdall = require('babel5-plugin-strip-heimdall');
 
+function uniqueAdd(obj, key, values) {
+  var a = obj[key] = obj[key] || [];
+
+  for (var i = 0; i < values.length; i++) {
+    if (a.indexOf(values[i]) === -1) {
+      a.push(values[i]);
+    }
+  }
+}
+
 module.exports = function(environment) {
   var featuresJsonPath = __dirname + '/../config/features.json';
   var featuresJson = fs.readFileSync(featuresJsonPath, { encoding: 'utf8' });
   var features = JSON.parse(featuresJson);
+  var filteredImports = {};
 
   // TODO explicitly set all features which are not enabled to `false`, so
   // they are stripped --> make this configurable or pass features
@@ -25,34 +36,25 @@ module.exports = function(environment) {
   ];
 
   if (process.env.INSTRUMENT_HEIMDALL === 'false') {
-    plugins.push(
-      stripHeimdall,
-      filterImports({
-        'ember-data/-private/debug': [
-          'instrument'
-        ]
-      })
-    );
+    plugins.push(stripHeimdall);
+    uniqueAdd(filteredImports, 'ember-data/-private/debug', ['instrument']);
   } else {
     console.warn('NOT STRIPPING HEIMDALL');
   }
 
   if (environment === 'production') {
-    plugins.push(
-      filterImports({
-        'ember-data/-private/debug': [
-          'assert',
-          'assertPolymorphicType',
-          'debug',
-          'deprecate',
-          'info',
-          'runInDebug',
-          'warn',
-          'debugSeal'
-        ]
-      })
-    );
+    uniqueAdd(filteredImports, 'ember-data/-private/debug', [
+      'assert',
+      'assertPolymorphicType',
+      'debug',
+      'deprecate',
+      'info',
+      'runInDebug',
+      'warn',
+      'debugSeal'
+    ]);
   }
+  plugins.push(filterImports(filteredImports));
 
   return plugins;
 };