diff --git a/tests/mhindex.py b/tests/mhindex.py
index 712b6ad..4be25ee 100644
--- a/tests/mhindex.py
+++ b/tests/mhindex.py
@@ -544,7 +544,7 @@ def getmtime(self, path):
             st = os.stat(path)
         except os.error, msg:
             return 0
-        return st[ST_MTIME]
+        return int(st[ST_MTIME])
 
     def maycommit(self):
         self.trans_count += 1