diff --git a/specs/phase0/beacon-chain.md b/specs/phase0/beacon-chain.md
index 8a51b5e8b..82257947d 100644
--- a/specs/phase0/beacon-chain.md
+++ b/specs/phase0/beacon-chain.md
@@ -773,7 +773,7 @@ def compute_committee(indices: Sequence[ValidatorIndex],
     """
     start = (len(indices) * index) // count
     end = (len(indices) * (index + 1)) // count
-    return [indices[compute_shuffled_index(ValidatorIndex(i), len(indices), seed)] for i in range(start, end)]
+    return [indices[compute_shuffled_index(i, len(indices), seed)] for i in range(start, end)]
 ```
 
 #### `compute_epoch_at_slot`