--- old/src/share/vm/compiler/compileBroker.cpp	2014-11-24 10:08:10.831740004 +0100
+++ new/src/share/vm/compiler/compileBroker.cpp	2014-11-24 10:08:10.751740008 +0100
@@ -1807,7 +1807,7 @@
                      os::file_separator(), thread_id, os::current_process_id());
       }
 
-      fp = fopen(file_name, "at");
+      fp = fopen(file_name, "wt");
       if (fp != NULL) {
         if (LogCompilation && Verbose) {
           tty->print_cr("Opening compilation log %s", file_name);