diff --git a/bin/tools/misc.py b/bin/tools/misc.py
index 4260282d426..c42c77a056e 100644
--- a/bin/tools/misc.py
+++ b/bin/tools/misc.py
@@ -560,7 +560,7 @@ class cache(object):
         
         def to_tuple(d):
             i = d.items()
-            i.sort()
+            i.sort(key=lambda (x,y): x)
             return tuple(i)
 
         if not self.multi: