Index: plugins/thunar-tpa/thunar-tpa-icon.c
===================================================================
--- plugins/thunar-tpa/thunar-tpa-icon.c	(revision 22534)
+++ plugins/thunar-tpa/thunar-tpa-icon.c	(working copy)
@@ -561,6 +561,9 @@
 
   /* setup the pixel size for the image */
   gtk_image_set_pixel_size (GTK_IMAGE (icon->image), pixel_size);
+  
+  /* force size of the button */
+  gtk_widget_set_size_request (icon->button, size, size);
 }