diff --git a/Sources/BraveWallet/Preview Content/MockJsonRpcService.swift b/Sources/BraveWallet/Preview Content/MockJsonRpcService.swift
index 9b5bd728060..14ccb777ffc 100644
--- a/Sources/BraveWallet/Preview Content/MockJsonRpcService.swift	
+++ b/Sources/BraveWallet/Preview Content/MockJsonRpcService.swift	
@@ -236,7 +236,7 @@ class MockJsonRpcService: BraveWalletJsonRpcService {
       completion(BraveWallet.FilecoinMainnet)
     case .btc:
       fallthrough
-    @unknown default:
+    default:
       completion("")
     }
   }