diff --git a/clientapi/routing/register_publickey_test.go b/clientapi/routing/register_publickey_test.go
index 19960ed22..352327b21 100644
--- a/clientapi/routing/register_publickey_test.go
+++ b/clientapi/routing/register_publickey_test.go
@@ -264,6 +264,7 @@ func TestRegisterEthereum(t *testing.T) {
 	// Asserts
 	assert := assert.New(t)
 	assert.NotNil(response, "response actual: nil, expected: not nil")
+	assert.Implements((*registerResponse)(nil), response.JSON, "response.JSON received: %v", response.JSON)
 	registerRes := response.JSON.(registerResponse)
 	assert.Truef(
 		registerRes.UserID == wallet.Eip155UserId,