diff --git a/test/Performance/run-perf_tests.py b/test/Performance/run-perf_tests.py
index 0b2ca2852..b8b578886 100644
--- a/test/Performance/run-perf_tests.py
+++ b/test/Performance/run-perf_tests.py
@@ -255,7 +255,7 @@ def get_sha1_file( filename ):
         sha1sum hash of the file
     """
     hash_size = 256
-    sha1 = hashlib.sha1()
+    sha1 = hashlib.sha256()
     with open( filename, 'rb' ) as f:
         while True:
             data = f.read( hash_size )