diff --git a/tools/test.py b/tools/test.py
index b90d144d5f5981..59bfb9e70b0885 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -1745,7 +1745,7 @@ def DoSkip(case):
     timed_tests.sort(lambda a, b: a.CompareTime(b))
     index = 1
     for entry in timed_tests[:20]:
-      t = FormatTime(entry.duration)
+      t = FormatTime(entry.duration.total_seconds())
       sys.stderr.write("%4i (%s) %s\n" % (index, t, entry.GetLabel()))
       index += 1