diff --git a/scripts/analyse-locks-simpletrace.py b/scripts/analyse-locks-simpletrace.py
index 352bc9c22d..30090bdfff 100755
--- a/scripts/analyse-locks-simpletrace.py
+++ b/scripts/analyse-locks-simpletrace.py
@@ -78,7 +78,7 @@ def get_args():
 
     # Now dump the individual lock stats
     for key, val in sorted(analyser.mutex_records.iteritems(),
-                           key=lambda (k,v): v["locks"]):
+                           key=lambda k_v: k_v[1]["locks"]):
         print ("Lock: %#x locks: %d, locked: %d, unlocked: %d" %
                (key, val["locks"], val["locked"], val["unlocked"]))