diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 9f4413c3..1701fd73 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -314,6 +314,24 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
       obj.constructor === jasmineGlobal.Set
     );
   };
+  
+  j$.isWeakMap = function(obj) {
+    return (
+      obj !== null &&
+      typeof obj !== 'undefined' &&
+      typeof jasmineGlobal.WeakMap !== 'undefined' &&
+      obj.constructor === jasmineGlobal.WeakMap
+    );
+  };
+
+  j$.isDataView = function(obj) {
+    return (
+      obj !== null &&
+      typeof obj !== 'undefined' &&
+      typeof jasmineGlobal.DataView !== 'undefined' &&
+      obj.constructor === jasmineGlobal.DataView
+    );
+  };
 
   j$.isPromise = function(obj) {
     return (
@@ -5908,11 +5926,11 @@ getJasmineRequireObj().toHaveSize = function(j$) {
             pass: false
           };
 
-        if (j$.isA_('WeakSet', actual) || j$.isA_('WeakMap', actual) || j$.isA_('DataView', actual)) {
+        if (j$.isA_('WeakSet', actual) || j$.isWeakMap(actual) || j$.isDataView(actual)) {
           throw new Error('Cannot get size of ' + actual + '.');
         }
 
-        if (actual instanceof Set || actual instanceof Map) {
+        if (j$.isSet(actual) || j$.isMap(actual)) {
           result.pass = actual.size === expected;
         } else if (isLength(actual.length)) {
           result.pass = actual.length === expected;
diff --git a/spec/core/baseSpec.js b/spec/core/baseSpec.js
index 4fce2254..b85721b9 100644
--- a/spec/core/baseSpec.js
+++ b/spec/core/baseSpec.js
@@ -51,4 +51,15 @@ describe('base helpers', function() {
       expect(jasmineUnderTest.isAsymmetricEqualityTester_(obj)).toBe(true);
     });
   });
+
+  describe('isSet', function() {
+    it('returns true when the object is a Set', function() {
+      jasmine.getEnv().requireFunctioningSets();
+      expect(jasmineUnderTest.isSet(new Set())).toBe(true);
+    });
+
+    it('returns false when the object is not a Set', function() {
+      expect(jasmineUnderTest.isSet({})).toBe(false);
+    });
+  });
 });
diff --git a/spec/core/matchers/toHaveSizeSpec.js b/spec/core/matchers/toHaveSizeSpec.js
index a1b4cccb..a14a24e5 100644
--- a/spec/core/matchers/toHaveSizeSpec.js
+++ b/spec/core/matchers/toHaveSizeSpec.js
@@ -110,6 +110,7 @@ describe('toHaveSize', function() {
   });
 
   it('throws an error for WeakSet', function() {
+    jasmine.getEnv().requireWeakSets();
     var matcher = jasmineUnderTest.matchers.toHaveSize();
 
     expect(function() {
@@ -118,11 +119,12 @@ describe('toHaveSize', function() {
   });
 
   it('throws an error for WeakMap', function() {
+    jasmine.getEnv().requireWeakMaps();
     var matcher = jasmineUnderTest.matchers.toHaveSize();
 
     expect(function() {
       matcher.compare(new WeakMap(), 2);
-    }).toThrowError('Cannot get size of [object WeakMap].');
+    }).toThrowError(/Cannot get size of \[object (WeakMap|Object)\]\./);
   });
 
   it('throws an error for DataView', function() {
@@ -130,6 +132,6 @@ describe('toHaveSize', function() {
 
     expect(function() {
       matcher.compare(new DataView(new ArrayBuffer(128)), 2);
-    }).toThrowError('Cannot get size of [object DataView].');
+    }).toThrowError(/Cannot get size of \[object (DataView|Object)\]\./);
   });
 });
diff --git a/spec/helpers/checkForMap.js b/spec/helpers/checkForMap.js
index 46e346a8..77fa1233 100644
--- a/spec/helpers/checkForMap.js
+++ b/spec/helpers/checkForMap.js
@@ -43,4 +43,10 @@
       env.pending('Browser has incomplete or missing support for Maps');
     }
   };
+
+  env.requireWeakMaps = function() {
+    if (typeof WeakMap === 'undefined') {
+      env.pending('Browser does not have support for WeakMap');
+    }
+  };
 })(jasmine.getEnv());
diff --git a/spec/helpers/checkForSet.js b/spec/helpers/checkForSet.js
index dacb06aa..8656342d 100644
--- a/spec/helpers/checkForSet.js
+++ b/spec/helpers/checkForSet.js
@@ -47,4 +47,10 @@
       env.pending('Browser has incomplete or missing support for Sets');
     }
   };
+
+  env.requireWeakSets = function() {
+    if (typeof WeakSet === 'undefined') {
+      env.pending('Browser does not have support for WeakSet');
+    }
+  };
 })(jasmine.getEnv());
diff --git a/src/core/base.js b/src/core/base.js
index e86a12c8..121ff614 100644
--- a/src/core/base.js
+++ b/src/core/base.js
@@ -148,6 +148,24 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     );
   };
 
+  j$.isWeakMap = function(obj) {
+    return (
+      obj !== null &&
+      typeof obj !== 'undefined' &&
+      typeof jasmineGlobal.WeakMap !== 'undefined' &&
+      obj.constructor === jasmineGlobal.WeakMap
+    );
+  };
+
+  j$.isDataView = function(obj) {
+    return (
+      obj !== null &&
+      typeof obj !== 'undefined' &&
+      typeof jasmineGlobal.DataView !== 'undefined' &&
+      obj.constructor === jasmineGlobal.DataView
+    );
+  };
+
   j$.isPromise = function(obj) {
     return (
       typeof jasmineGlobal.Promise !== 'undefined' &&
diff --git a/src/core/matchers/toHaveSize.js b/src/core/matchers/toHaveSize.js
index c0e84cb3..4f6ace0c 100644
--- a/src/core/matchers/toHaveSize.js
+++ b/src/core/matchers/toHaveSize.js
@@ -16,11 +16,11 @@ getJasmineRequireObj().toHaveSize = function(j$) {
             pass: false
           };
 
-        if (j$.isA_('WeakSet', actual) || j$.isA_('WeakMap', actual) || j$.isA_('DataView', actual)) {
+        if (j$.isA_('WeakSet', actual) || j$.isWeakMap(actual) || j$.isDataView(actual)) {
           throw new Error('Cannot get size of ' + actual + '.');
         }
 
-        if (actual instanceof Set || actual instanceof Map) {
+        if (j$.isSet(actual) || j$.isMap(actual)) {
           result.pass = actual.size === expected;
         } else if (isLength(actual.length)) {
           result.pass = actual.length === expected;