diff --git a/specs/core/1_shard-data-chains.md b/specs/core/1_shard-data-chains.md
index a6e9c997f..f24c6f9c3 100644
--- a/specs/core/1_shard-data-chains.md
+++ b/specs/core/1_shard-data-chains.md
@@ -270,8 +270,8 @@ def get_shard_block_proposer_index(state: BeaconState,
         return None
 
     MAX_RANDOM_BYTE = 2**8 - 1
-    seed = get_seed(state, current_epoch, DOMAIN_SHARD_PROPOSER)
-    seed = hash(seed + int_to_bytes(shard, length=8) + int_to_bytes(slot, length=8))
+    epoch_seed = get_seed(state, current_epoch, DOMAIN_SHARD_PROPOSER)
+    seed = hash(epoch_seed + int_to_bytes(shard, length=8) + int_to_bytes(slot, length=8))
     i = 0
     while True:
         candidate_index = active_indices[(slot + i) % len(active_indices)]