diff --git a/test/active_model_serializers/test/schema_test.rb b/test/active_model_serializers/test/schema_test.rb
index d217d0064..0fe497d78 100644
--- a/test/active_model_serializers/test/schema_test.rb
+++ b/test/active_model_serializers/test/schema_test.rb
@@ -116,7 +116,7 @@ def test_with_a_non_existent_file
 
       def test_that_raises_with_a_invalid_json_body
         # message changes from JSON gem 2.0.2 to 2.2.0
-        message = /A JSON text must at least contain two octets!|an unexpected token at ''/
+        message = /A JSON text must at least contain two octets!|unexpected token at ''/
 
         get :invalid_json_body