--- a/hotspot/src/share/vm/gc/g1/g1OopClosures.cpp	Mon Sep 28 15:05:02 2015 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1OopClosures.cpp	Tue Sep 29 11:02:08 2015 +0200
@@ -55,7 +55,7 @@
   _worker_id = par_scan_state->worker_id();
 
   assert(_worker_id < ParallelGCThreads,
-         err_msg("The given worker id %u must be less than the number of threads %u", _worker_id, ParallelGCThreads));
+         "The given worker id %u must be less than the number of threads %u", _worker_id, ParallelGCThreads);
 }
 
 // Generate G1 specialized oop_oop_iterate functions.