--- a/hotspot/src/share/vm/compiler/compileBroker.cpp	Thu Nov 13 09:19:46 2014 +0100
+++ b/hotspot/src/share/vm/compiler/compileBroker.cpp	Wed Nov 26 08:06:58 2014 +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);