diff --git a/src/chain/state.rs b/src/chain/state.rs
index cd9a11d7..b48cc569 100644
--- a/src/chain/state.rs
+++ b/src/chain/state.rs
@@ -111,8 +111,8 @@ impl State {
                         new_state.height,
                         new_state.round,
                         new_state.step,
-                        self.consensus_state.block_id.as_ref().unwrap(),
-                        new_state.block_id.unwrap()
+                        self.consensus_state.block_id_prefix(),
+                        new_state.block_id_prefix()
                     )
                 }
             }