diff --git a/src/auto/injector.js b/src/auto/injector.js
index f6980a671403..303348f5ee67 100644
--- a/src/auto/injector.js
+++ b/src/auto/injector.js
@@ -718,6 +718,7 @@ function createInjector(modulesToLoad, strictDi) {
   // Module Loading
   ////////////////////////////////////
   function loadModules(modulesToLoad) {
+    assertArg(isUndefined(modulesToLoad) || isArray(modulesToLoad), 'modulesToLoad', 'not an array');
     var runBlocks = [], moduleFn;
     forEach(modulesToLoad, function(module) {
       if (loadedModules.get(module)) return;
diff --git a/test/auto/injectorSpec.js b/test/auto/injectorSpec.js
index cff2ec5b0e7b..391082e28a26 100644
--- a/test/auto/injectorSpec.js
+++ b/test/auto/injectorSpec.js
@@ -35,6 +35,12 @@ describe('injector', function() {
   });
 
 
+  it('should check its modulesToLoad argument', function() {
+    expect(function() { angular.injector('test'); })
+        .toThrowMinErr('ng', 'areq');
+  });
+
+
   it('should resolve dependency graph and instantiate all services just once', function() {
     var log = [];