diff --git a/include/wx/osx/core/private.h b/include/wx/osx/core/private.h
index bc4c852bce..cc584f563b 100644
--- a/include/wx/osx/core/private.h
+++ b/include/wx/osx/core/private.h
@@ -1098,5 +1098,17 @@ protected:
     T m_ptr;
 };
 
+// This macro checks if the evaluation of cond, having a return value of
+// OS Error type, is zero, ie no error occurred, and calls the assert handler
+// with the provided message if it isn't.
+#define wxOSX_VERIFY_NOERR(cond)                                          \
+    wxSTATEMENT_MACRO_BEGIN                                               \
+        const unsigned long evalOnce = (cond);                            \
+        if ( evalOnce != 0 )                                              \
+        {                                                                 \
+            wxFAIL_COND_MSG(#cond, GetMacOSStatusErrorString(evalOnce));  \
+        }                                                                 \
+    wxSTATEMENT_MACRO_END
+
 #endif
     // _WX_PRIVATE_CORE_H_
diff --git a/src/osx/carbon/region.cpp b/src/osx/carbon/region.cpp
index 907b0f33fd..48e6213059 100644
--- a/src/osx/carbon/region.cpp
+++ b/src/osx/carbon/region.cpp
@@ -1036,7 +1036,7 @@ bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 
     AllocExclusive();
 
-    __Verify_noErr(HIShapeOffset( M_REGION , x , y )) ;
+    wxOSX_VERIFY_NOERR(HIShapeOffset( M_REGION , x , y )) ;
 
     return true ;
 }
@@ -1091,11 +1091,11 @@ bool wxRegion::DoCombine(const wxRegion& region, wxRegionOp op)
     switch (op)
     {
         case wxRGN_AND:
-            __Verify_noErr(HIShapeIntersect( M_REGION , OTHER_M_REGION(region) , M_REGION ));
+            wxOSX_VERIFY_NOERR(HIShapeIntersect( M_REGION , OTHER_M_REGION(region) , M_REGION ));
             break ;
 
         case wxRGN_OR:
-            __Verify_noErr(HIShapeUnion( M_REGION , OTHER_M_REGION(region) , M_REGION ));
+            wxOSX_VERIFY_NOERR(HIShapeUnion( M_REGION , OTHER_M_REGION(region) , M_REGION ));
             break ;
 
         case wxRGN_XOR:
@@ -1103,12 +1103,12 @@ bool wxRegion::DoCombine(const wxRegion& region, wxRegionOp op)
                 // XOR is defined as the difference between union and intersection
                 wxCFRef< HIShapeRef > unionshape( HIShapeCreateUnion( M_REGION , OTHER_M_REGION(region) ) );
                 wxCFRef< HIShapeRef > intersectionshape( HIShapeCreateIntersection( M_REGION , OTHER_M_REGION(region) ) );
-                __Verify_noErr(HIShapeDifference( unionshape, intersectionshape, M_REGION ));
+                wxOSX_VERIFY_NOERR(HIShapeDifference( unionshape, intersectionshape, M_REGION ));
             }
             break ;
 
         case wxRGN_DIFF:
-            __Verify_noErr(HIShapeDifference( M_REGION , OTHER_M_REGION(region) , M_REGION )) ;
+            wxOSX_VERIFY_NOERR(HIShapeDifference( M_REGION , OTHER_M_REGION(region) , M_REGION )) ;
             break ;
 
         case wxRGN_COPY:
diff --git a/src/osx/core/bitmap.cpp b/src/osx/core/bitmap.cpp
index 8ea663286f..8a10cc4f93 100644
--- a/src/osx/core/bitmap.cpp
+++ b/src/osx/core/bitmap.cpp
@@ -893,7 +893,7 @@ IconRef wxBitmap::GetIconRef() const
 IconRef wxBitmap::CreateIconRef() const
 {
     IconRef icon = GetIconRef();
-    __Verify_noErr(AcquireIconRef(icon));
+    wxOSX_VERIFY_NOERR(AcquireIconRef(icon));
     return icon;
 }
 #endif
@@ -1897,7 +1897,7 @@ bool wxICNSResourceHandler::LoadFile(wxBitmap *bitmap,
     {
         IconRef iconRef = NULL ;
         
-        __Verify_noErr(GetIconRef( kOnSystemDisk, kSystemIconsCreator, theId, &iconRef )) ;
+        wxOSX_VERIFY_NOERR(GetIconRef( kOnSystemDisk, kSystemIconsCreator, theId, &iconRef )) ;
         img = wxOSXGetNSImageFromIconRef(iconRef);
     }
     else