--- a/hotspot/src/share/vm/runtime/os.cpp	Mon Sep 28 15:05:02 2015 +0200
+++ b/hotspot/src/share/vm/runtime/os.cpp	Tue Sep 29 11:02:08 2015 +0200
@@ -1679,7 +1679,7 @@
 
 #ifndef PRODUCT
 
-#define assert_eq(a,b) assert(a == b, err_msg(SIZE_FORMAT " != " SIZE_FORMAT, a, b))
+#define assert_eq(a,b) assert(a == b, SIZE_FORMAT " != " SIZE_FORMAT, a, b)
 
 class TestOS : AllStatic {
   static size_t small_page_size() {