diff --git a/watcher/decision_engine/strategy/strategies/storage_capacity_balance.py b/watcher/decision_engine/strategy/strategies/storage_capacity_balance.py
index 648839b62..7fdf753d0 100644
--- a/watcher/decision_engine/strategy/strategies/storage_capacity_balance.py
+++ b/watcher/decision_engine/strategy/strategies/storage_capacity_balance.py
@@ -207,6 +207,7 @@ class StorageCapacityBalance(base.WorkloadStabilizationBaseStrategy):
 
     def check_pool_type(self, volume, dest_pool):
         target_type = None
+        src_extra_specs = {}
         # check type feature
         if not volume.volume_type:
             return target_type