diff --git a/clientapi/auth/login_publickey_ethereum.go b/clientapi/auth/login_publickey_ethereum.go
index 7b8573ab6..a20896ec8 100644
--- a/clientapi/auth/login_publickey_ethereum.go
+++ b/clientapi/auth/login_publickey_ethereum.go
@@ -119,7 +119,7 @@ func (pk LoginPublicKeyEthereum) ValidateLoginResponse() (bool, *jsonerror.Matri
 	// Check signature to verify message was not tempered
 	_, err = message.Verify(pk.Signature, (*string)(&pk.config.Matrix.ServerName), nil, nil)
 	if err != nil {
-		return false, jsonerror.InvalidSignature(err.Error() + " signature:" + pk.Signature + " server_name:" + string(pk.config.Matrix.ServerName) + " message:" + pk.Message)
+		return false, jsonerror.InvalidSignature(err.Error() + " " + pk.Signature + " " + string(pk.config.Matrix.ServerName))
 	}
 
 	// Error if the user ID does not match the signed message.