diff --git a/direct/src/directutil/WeightedChoice.py b/direct/src/directutil/WeightedChoice.py
index 134f609a59..3038a32947 100755
--- a/direct/src/directutil/WeightedChoice.py
+++ b/direct/src/directutil/WeightedChoice.py
@@ -10,8 +10,8 @@ class WeightedChoice:
         self.listOfLists = listOfLists
         self.weightIndex = weightIndex
    
-    def choose(self):
-        roll = random.randrange(self.total)
+    def choose(self, rng=random):
+        roll = rng.randrange(self.total)
         weight = self.weightIndex
         for i in self.listOfLists:
             roll -= i[weight]