diff --git a/include/wx/mac/carbon/bitmap.h b/include/wx/mac/carbon/bitmap.h
index c051d22fdb..ff0c31c02c 100644
--- a/include/wx/mac/carbon/bitmap.h
+++ b/include/wx/mac/carbon/bitmap.h
@@ -110,7 +110,10 @@ public:
 
     // Copy constructors
     wxBitmap(const wxBitmap& bitmap)
-    { Ref(bitmap); }
+        : wxBitmapBase()
+    {
+        Ref(bitmap);
+    }
 
     // Initialize with raw data.
     wxBitmap(const char bits[], int width, int height, int depth = 1);
diff --git a/include/wx/mac/carbon/icon.h b/include/wx/mac/carbon/icon.h
index cc90942c70..f070bc224c 100644
--- a/include/wx/mac/carbon/icon.h
+++ b/include/wx/mac/carbon/icon.h
@@ -26,7 +26,10 @@ public:
 
     // Copy constructors
     wxIcon(const wxIcon& icon)
-      { Ref(icon); }
+        : wxGDIObject()
+    {
+        Ref(icon);
+    }
 
     wxIcon(const char **data);
     wxIcon(char **data);
@@ -62,7 +65,7 @@ public:
     void SetHeight(int h);
     void SetDepth(int d);
     void SetOk(bool isOk);
-    
+
     WXHICON GetHICON() const ;
 
     DECLARE_DYNAMIC_CLASS(wxIcon)