diff --git a/mailgun_test.go b/mailgun_test.go
index 8ac3f705..815b4067 100644
--- a/mailgun_test.go
+++ b/mailgun_test.go
@@ -34,7 +34,7 @@ func TestInvalidBaseAPI(t *testing.T) {
 	ctx := context.Background()
 	_, err := mg.GetDomain(ctx, "unknown.domain")
 	ensure.NotNil(t, err)
-	ensure.DeepEqual(t, err.Error(), `BaseAPI must end with a /v2, /v3 or /v4; setBaseAPI("https://host/v3")`)
+	ensure.DeepEqual(t, err.Error(), `BaseAPI must end with a /v1, /v2, /v3 or /v4; setBaseAPI("https://host/v3")`)
 }
 
 func TestValidBaseAPI(t *testing.T) {