diff --git a/test/ref.test.js b/test/ref.test.js
index 3f693e1c..eae4703a 100644
--- a/test/ref.test.js
+++ b/test/ref.test.js
@@ -2041,6 +2041,6 @@ test('ref internal - throw if schema has definition twice with different shape',
   try {
     build(schema)
   } catch (err) {
-    t.assert.equal(err.message, 'There is already another anchor "#uri" in a schema "test".')
+    t.assert.equal(err.message, 'There is already another anchor "#uri" in schema "test".')
   }
 })