diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index 0ff685a..518a4b1 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -4240,7 +4240,7 @@
 		GTK_FONT_SELECTION_DIALOG(dialog), (const char *)oldname);
 
 	if (oldname != oldval)
-	    vim_free(oldval);
+	    vim_free(oldname);
     }
 
     response = gtk_dialog_run(GTK_DIALOG(dialog));