diff --git a/packages/experimental/src.ts/eip1193-bridge.ts b/packages/experimental/src.ts/eip1193-bridge.ts
index 86e53350f4..cf57f6c262 100644
--- a/packages/experimental/src.ts/eip1193-bridge.ts
+++ b/packages/experimental/src.ts/eip1193-bridge.ts
@@ -59,7 +59,7 @@ export class Eip1193Bridge extends EventEmitter {
              }
              case "eth_chainId": {
                  const result = await this.provider.getNetwork();
-                 return result.chainId;
+                 return ethers.utils.hexValue(result.chainId);
              }
              case "eth_getBalance": {
                  const result = await this.provider.getBalance(params[0], params[1]);