diff --git a/src/Pools/EcsPool.cs b/src/Pools/EcsPool.cs
index b63ea99..325bbe6 100644
--- a/src/Pools/EcsPool.cs
+++ b/src/Pools/EcsPool.cs
@@ -136,7 +136,7 @@ namespace DCFApixels.DragonECS
             if (_isLocked) { EcsPoolThrowHelper.ThrowPoolLocked(); }
 #elif DRAGONECS_STABILITY_MODE
             if (itemIndex > 0) { return ref Get(entityID); }
-            if (_isLocked | _source.IsUsed(entityID) == false) { return ref _items[0]; }
+            if (_isLocked | _world.IsUsed(entityID) == false) { return ref _items[0]; }
 #endif
             if (_recycledItemsCount > 0)
             {
diff --git a/src/Pools/EcsTagPool.cs b/src/Pools/EcsTagPool.cs
index 203293c..74342b2 100644
--- a/src/Pools/EcsTagPool.cs
+++ b/src/Pools/EcsTagPool.cs
@@ -120,7 +120,7 @@ namespace DCFApixels.DragonECS
             if (Has(entityID)) { EcsPoolThrowHelper.ThrowAlreadyHasComponent<T>(entityID); }
             if (_isLocked) { EcsPoolThrowHelper.ThrowPoolLocked(); }
 #elif DRAGONECS_STABILITY_MODE
-            if (Has(entityID) | _source.IsUsed(entityID) == false | _isLocked) { return; }
+            if (Has(entityID) | _world.IsUsed(entityID) == false | _isLocked) { return; }
 #endif
             _count++;
             _mapping[entityID] = true;