diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 0f0ad8f99..03be5ee17 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1077,7 +1077,7 @@ def get_bitfield_bit(bitfield: bytes, i: int) -> int:
     """
     Extract the bit in ``bitfield`` at position ``i``.
     """
-    return (bitfield[i // 8] >> (7 - (i % 8))) % 2
+    return (bitfield[i // 8] >> (i % 8)) % 2
 ```
 
 ### `verify_bitfield`