diff --git a/ppdet/utils/eval_utils.py b/ppdet/utils/eval_utils.py
index 63d0fa4e094c6e3094981ad792fb2ee89301f048..9dd7edc11f0619f425d05965197ca9cc8322d14b 100644
--- a/ppdet/utils/eval_utils.py
+++ b/ppdet/utils/eval_utils.py
@@ -48,7 +48,6 @@ def parse_fetches(fetches, prog=None, extra_keys=None):
         for k in extra_keys:
             try:
                 v = fluid.framework._get_var(k, prog)
-                v.persistable = True
                 keys.append(k)
                 values.append(v.name)
             except Exception: