diff --git a/crates/ethereum/evm/src/lib.rs b/crates/ethereum/evm/src/lib.rs
index c8ed58df03..206230cd00 100644
--- a/crates/ethereum/evm/src/lib.rs
+++ b/crates/ethereum/evm/src/lib.rs
@@ -55,7 +55,7 @@ impl EthEvmConfig {
     }
 
     /// Returns the chain spec associated with this configuration.
-    pub fn chain_spec(&self) -> &ChainSpec {
+    pub const fn chain_spec(&self) -> &Arc<ChainSpec> {
         &self.chain_spec
     }
 }
diff --git a/crates/optimism/evm/src/lib.rs b/crates/optimism/evm/src/lib.rs
index 52b974e6c8..3107462751 100644
--- a/crates/optimism/evm/src/lib.rs
+++ b/crates/optimism/evm/src/lib.rs
@@ -50,7 +50,7 @@ impl OpEvmConfig {
     }
 
     /// Returns the chain spec associated with this configuration.
-    pub fn chain_spec(&self) -> &OpChainSpec {
+    pub const fn chain_spec(&self) -> &Arc<OpChainSpec> {
         &self.chain_spec
     }
 }