diff --git a/lcl/interfaces/gtk/gtkwscontrols.pp b/lcl/interfaces/gtk/gtkwscontrols.pp
index 166daa81ec..43c707ff24 100644
--- a/lcl/interfaces/gtk/gtkwscontrols.pp
+++ b/lcl/interfaces/gtk/gtkwscontrols.pp
@@ -990,8 +990,8 @@ begin
       end;
     gbPixbuf:
       begin
-        Pixmap := gdk_pixmap_new(nil, ABitmap.Width, ABitmap.Height, 24);
-        Mask := gdk_pixmap_new(nil, ABitmap.Width, ABitmap.Height, 1);
+        Pixmap := nil;
+        Mask := nil;
         gdk_pixbuf_render_pixmap_and_mask(GDIObject^.GDIPixbufObject, Pixmap, Mask, $80);
       end;
   end;