diff --git a/product/ERP5Form/tests/testFields.py b/product/ERP5Form/tests/testFields.py
index 1663d027d5e1fcdc20b09e157b2a053c5e134689..4efdf4b81e0c2c34938b471428f444b96677fa26 100644
--- a/product/ERP5Form/tests/testFields.py
+++ b/product/ERP5Form/tests/testFields.py
@@ -936,7 +936,7 @@ class TestFieldValueCache(ERP5TypeTestCase):
 
   def _getCacheSize(self, cache_id):
     count = 0
-    for cache_key in field_value_cache.viewkeys():
+    for cache_key in field_value_cache.iterkeys():
       if cache_key[0] == cache_id:
         count += 1