diff --git a/packages/valory/skills/decision_maker_abci/behaviours/storage_manager.py b/packages/valory/skills/decision_maker_abci/behaviours/storage_manager.py
index 04e5ba0e..4682462a 100644
--- a/packages/valory/skills/decision_maker_abci/behaviours/storage_manager.py
+++ b/packages/valory/skills/decision_maker_abci/behaviours/storage_manager.py
@@ -284,7 +284,7 @@ def _update_accuracy_store(self) -> None:
         # update the accuracy store using the latest accuracy information (only entered during the first period)
         for row in reader:
             tool = row[self.acc_info_fields.tool]
-            if tool not in accuracy_store.keys():
+            if tool not in self.mech_tools:
                 continue
 
             # overwrite local with global information (naturally, no global information is available for pending)