--- a/src/util.c
+++ b/src/util.c
@@ -210,7 +210,7 @@ void create_error_dialog(gchar *errorstring)
 				   GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
 				   GTK_MESSAGE_ERROR,
 				   GTK_BUTTONS_CLOSE,
-				   errorstring);
+				   "%s", errorstring);
   g_signal_connect_object(GTK_OBJECT(dialog),
 			  "delete_event",
 			  G_CALLBACK(gtk_widget_destroy),
@@ -234,7 +234,7 @@ gboolean request_confirmation_dialog(gchar *confirmstring)
 				   GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
 				   GTK_MESSAGE_QUESTION,
 				   GTK_BUTTONS_YES_NO,
-				   confirmstring);
+				   "%s", confirmstring);
   i = gtk_dialog_run(GTK_DIALOG(dialog));
   gtk_widget_destroy(dialog);
   if (i == GTK_RESPONSE_YES) {