diff --git a/jam/patchlevel.h b/jam/patchlevel.h
index e7f8dd074c..46bd80be75 100644
--- a/jam/patchlevel.h
+++ b/jam/patchlevel.h
@@ -1,5 +1,5 @@
 /* Keep JAMVERSYM in sync with VERSION. */
 /* It can be accessed as $(JAMVERSION) in the Jamfile. */
 
-#define VERSION "2.5-haiku-20090626"
-#define JAMVERSYM "JAMVERSION=2.5"
+#define VERSION "2.5-haiku-20111222"
+#define JAMVERSYM "JAMVERSION=2.5-haiku-20111222"