diff --git a/packages/nextjs/hooks/useFetchContractAbi.ts b/packages/nextjs/hooks/useFetchContractAbi.ts
index 42198597..3348037b 100644
--- a/packages/nextjs/hooks/useFetchContractAbi.ts
+++ b/packages/nextjs/hooks/useFetchContractAbi.ts
@@ -12,7 +12,7 @@ type FetchContractAbiParams = {
 };
 
 const useFetchContractAbi = ({ contractAddress, chainId, disabled = false }: FetchContractAbiParams) => {
-  const [implementationAddress, setImplementationAddress] = useState<string | null>(null);
+  const [implementationAddress, setImplementationAddress] = useState<Address | null>(null);
 
   const fetchAbi = async () => {
     if (!isAddress(contractAddress)) {