Index: src/macosx/system.m
===================================================================
--- src/macosx/system.m	(revision 7527)
+++ src/macosx/system.m	(working copy)
@@ -563,7 +563,8 @@
 {
    char tmp[ALLEGRO_MESSAGE_SIZE];
    
-   _al_sane_strncpy(osx_window_title, title, ALLEGRO_MESSAGE_SIZE);
+   if (osx_window_title != title)
+	_al_sane_strncpy(osx_window_title, title, ALLEGRO_MESSAGE_SIZE);
    do_uconvert(title, U_CURRENT, tmp, U_UTF8, ALLEGRO_MESSAGE_SIZE);
 
    NSString *ns_title = [NSString stringWithUTF8String: tmp];