diff --git a/plugins/sort/pluma-sort-plugin.c b/plugins/sort/pluma-sort-plugin.c
index a2dfc97..9ca9dc6 100755
--- a/plugins/sort/pluma-sort-plugin.c
+++ b/plugins/sort/pluma-sort-plugin.c
@@ -184,7 +184,7 @@ get_sort_dialog (ActionData *action_data)
 		pluma_warning (GTK_WINDOW (action_data->window),
 			       "%s", err_message);
 
-		g_free (dialog);
+		g_slice_free (SortDialog, dialog);
 		gtk_widget_destroy (error_widget);
 
 		return NULL;