diff --git a/src/mac/carbon/notebmac.cpp b/src/mac/carbon/notebmac.cpp
index 150fe2e87b..6fd2eca381 100644
--- a/src/mac/carbon/notebmac.cpp
+++ b/src/mac/carbon/notebmac.cpp
@@ -450,7 +450,7 @@ void wxNotebook::MacSetupTabs()
             // afterwards Unregister it (IconRef is ref counted, so it will stay on the tab even if we
             // unregister it) in case this will ever lead to having the same icon everywhere add some kind
             // of static counter
-            wxBitmap* bmap = GetImageList()->GetBitmap( GetPageImage(ii ) ) ;
+            const wxBitmap* bmap = GetImageList()->GetBitmap( GetPageImage(ii ) ) ;
             if ( bmap )
             {
                 wxBitmap scaledBitmap ;
diff --git a/src/mac/notebmac.cpp b/src/mac/notebmac.cpp
index 150fe2e87b..6fd2eca381 100644
--- a/src/mac/notebmac.cpp
+++ b/src/mac/notebmac.cpp
@@ -450,7 +450,7 @@ void wxNotebook::MacSetupTabs()
             // afterwards Unregister it (IconRef is ref counted, so it will stay on the tab even if we
             // unregister it) in case this will ever lead to having the same icon everywhere add some kind
             // of static counter
-            wxBitmap* bmap = GetImageList()->GetBitmap( GetPageImage(ii ) ) ;
+            const wxBitmap* bmap = GetImageList()->GetBitmap( GetPageImage(ii ) ) ;
             if ( bmap )
             {
                 wxBitmap scaledBitmap ;