diff --git a/recipes.py b/recipes.py
index 37ef45f..3e05f67 100644
--- a/recipes.py
+++ b/recipes.py
@@ -1,5 +1,4 @@
 from abc import abstractmethod
-from collections import defaultdict
 import collections
 import sys
 from typing import Dict, List, Any, Optional, Self, Set
@@ -279,7 +278,7 @@ class Ingredient(Element):
         return None
 
     def convert(self, amount: float, unitfrom: Unit, unitto: Unit) -> Optional[float]:
-        conversions: Dict[str, Dict[str, float]] = defaultdict(dict)
+        conversions: Dict[str, Dict[str, float]] = collections.defaultdict(dict)
         # construct node tree
         convs = self.conversions
         for unit in self.ctx.units.units: