diff --git a/spec/core/matchers/matchersUtilSpec.js b/spec/core/matchers/matchersUtilSpec.js
index d6ab504e..7fd98ad4 100644
--- a/spec/core/matchers/matchersUtilSpec.js
+++ b/spec/core/matchers/matchersUtilSpec.js
@@ -93,6 +93,24 @@ describe("matchersUtil", function() {
       expect(jasmineUnderTest.matchersUtil.equals(new Error("foo"), new Error("bar"))).toBe(false);
     });
 
+    it("fails for objects with different constructors", function() {
+      function One() {}
+      function Two() {}
+
+      expect(jasmineUnderTest.matchersUtil.equals(new One(), new Two())).toBe(false);
+    });
+
+    if (typeof document === 'object') {
+      it("passes for equivalent objects from different frames", function() {
+        var iframe = document.createElement('iframe');
+        document.body.appendChild(iframe);
+        console.log(iframe);
+        iframe.contentWindow.eval('window.testObject = {}');
+        expect(jasmineUnderTest.matchersUtil.equals({}, iframe.contentWindow.testObject)).toBe(true);
+        document.body.removeChild(iframe);
+      });
+    }
+
     it("passes for Objects that are equivalent (simple case)", function() {
       expect(jasmineUnderTest.matchersUtil.equals({a: "foo"}, {a: "foo"})).toBe(true);
     });
diff --git a/src/core/matchers/matchersUtil.js b/src/core/matchers/matchersUtil.js
index ef92c1d4..900c0950 100644
--- a/src/core/matchers/matchersUtil.js
+++ b/src/core/matchers/matchersUtil.js
@@ -178,8 +178,8 @@ getJasmineRequireObj().matchersUtil = function(j$) {
       // Objects with different constructors are not equivalent, but `Object`s
       // or `Array`s from different frames are.
       var aCtor = a.constructor, bCtor = b.constructor;
-      if (aCtor !== bCtor && !(isFunction(aCtor) && aCtor instanceof aCtor &&
-                               isFunction(bCtor) && bCtor instanceof bCtor)) {
+      if (aCtor !== bCtor && !(isObjectConstructor(aCtor) &&
+                               isObjectConstructor(bCtor))) {
         return false;
       }
     }
@@ -239,5 +239,13 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     function isFunction(obj) {
       return typeof obj === 'function';
     }
+
+    function isObjectConstructor(ctor) {
+      // aCtor instanceof aCtor is true for the Object and Function
+      // constructors (since a constructor is-a Function and a function is-a
+      // Object). We don't just compare ctor === Object because the constructor
+      // might come from a different frame with different globals.
+      return isFunction(ctor) && ctor instanceof ctor;
+    }
   }
 };