diff --git a/master.cfg b/master.cfg
index cda2762..5ad1079 100644
--- a/master.cfg
+++ b/master.cfg
@@ -178,7 +178,7 @@ def SendRootMessageGDBTesters (branch, change):
     s.quit ()
 
 def make_breakage_lockfile_name (builder):
-    return "/tmp/gdb-buildbot-breakage-report-%s.lock" % builder
+    return "/tmp/gdb-buildbot-breakage-report-%s" % builder
 
 def SendAuthorMessage (name, change, text_prepend):
     """Send a message to the author of the commit if it broke GDB.