diff --git a/direct/src/showbase/RandomNumGen.py b/direct/src/showbase/RandomNumGen.py
index f467be35a1..438bca51b6 100644
--- a/direct/src/showbase/RandomNumGen.py
+++ b/direct/src/showbase/RandomNumGen.py
@@ -10,7 +10,7 @@ def randHash(num):
     bit patterns (i.e. doIds or zoneIds) to numbers with random bit patterns
     """
     rng = RandomNumGen(num)
-    return rng.randint(0,1<<16)
+    return rng.randint(0, (1<<16) - 1)
 
 class RandomNumGen:
     notify = \