diff --git a/lib/Echidna/ABI.hs b/lib/Echidna/ABI.hs
index 1701d24c3..6b97b9116 100644
--- a/lib/Echidna/ABI.hs
+++ b/lib/Echidna/ABI.hs
@@ -175,7 +175,7 @@ getRandomUint n =
     [ (getRandomR (0, 1023), 1)
     , (getRandomR (0, 2 ^ n - 5), 8)
     , (getRandomR (2 ^ n - 5, 2 ^ n - 1), 1)
-    , (getRandomPow (n - 5), 4)
+    , (getRandomPow (n - 5), 1)
     ]
 
 getRandomInt :: MonadRandom m => Int -> m Integer