diff --git a/crates/chainspec/src/api.rs b/crates/chainspec/src/api.rs
index f0cc31bb44dc..94b4285f92dd 100644
--- a/crates/chainspec/src/api.rs
+++ b/crates/chainspec/src/api.rs
@@ -109,6 +109,6 @@ impl EthChainSpec for ChainSpec {
     }
 
     fn is_optimism(&self) -> bool {
-        self.chain.is_optimism()
+        false
     }
 }