diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index cb50e2f86..6f28c0e3d 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1295,7 +1295,7 @@ def process_justification_and_finalization(state: BeaconState) -> None:
 
     # Process justifications
     state.previous_justified_checkpoint = state.current_justified_checkpoint
-    state.justification_bits[1:] = state.justification_bits[:JUSTIFICATION_BITS_LENGTH - 1]
+    state.justification_bits[1:] = state.justification_bits[:-1]
     state.justification_bits[0] = 0b0
     matching_target_attestations = get_matching_target_attestations(state, previous_epoch)  # Previous epoch
     if get_attesting_balance(state, matching_target_attestations) * 3 >= get_total_active_balance(state) * 2: