diff --git a/unittests/test_bitmap.py b/unittests/test_bitmap.py
index 1f9aba32..e70b5bc6 100644
--- a/unittests/test_bitmap.py
+++ b/unittests/test_bitmap.py
@@ -112,6 +112,7 @@ class BitmapTests(wtc.WidgetTestCase):
         wx.BitmapBufferFormat_RGB32
         wx.BitmapBufferFormat_ARGB32
 
+    @unittest.skipIf('wxMac' in wx.PlatformInfo, 'Changing exiting bitmap size not allowed on wxMac')
     def test_bitmapSetSize(self):
         b1 = wx.Bitmap(1,1)
         b1.SetSize((20,30))
diff --git a/unittests/test_bmpcbox.py b/unittests/test_bmpcbox.py
index 90b8f2b9..d1ea76e6 100644
--- a/unittests/test_bmpcbox.py
+++ b/unittests/test_bmpcbox.py
@@ -14,6 +14,7 @@ imgFiles = [os.path.join(os.path.dirname(__file__), 'LB01.png'),
 
 class bmpcbox_Tests(wtc.WidgetTestCase):
 
+    @unittest.skipIf('wxMac' in wx.PlatformInfo, 'Needs a real MainLoop on wxMac')
     def test_bmpcbox1(self):
         pnl = wx.Panel(self.frame)
 
@@ -34,6 +35,7 @@ class bmpcbox_Tests(wtc.WidgetTestCase):
         self.waitFor(300)
 
 
+    @unittest.skipIf('wxMac' in wx.PlatformInfo, 'Needs a real MainLoop on wxMac')
     def test_bmpcbox2(self):
         pnl = wx.Panel(self.frame)