diff --git a/spec/unit/defines/server/grant_spec.rb b/spec/unit/defines/server/grant_spec.rb
index da5892d86b..b3028e405a 100644
--- a/spec/unit/defines/server/grant_spec.rb
+++ b/spec/unit/defines/server/grant_spec.rb
@@ -215,7 +215,7 @@
       "class {'postgresql::server':}"
     end
 
-    it { is_expected.to compile.and_raise_error(/parameter 'object_name' expects a value of type (Undef, )?Array, or String, got Integer/) }
+    it { is_expected.to compile.and_raise_error(/parameter 'object_name' expects a value of type (Array|Undef, Array,) or String, got Integer/) }
   end
 
   context 'invalid object_name - insufficent array elements' do