diff --git a/src/Umbraco.Tests/TypeFinderTests.cs b/src/Umbraco.Tests/TypeFinderTests.cs
index 7d052d7cbc..ca3f80936d 100644
--- a/src/Umbraco.Tests/TypeFinderTests.cs
+++ b/src/Umbraco.Tests/TypeFinderTests.cs
@@ -447,7 +447,9 @@ namespace Umbraco.Tests
                     "HtmlAgilityPack.",
                     "TidyNet.",
                     "ICSharpCode.",
-                    "CookComputing."
+                    "CookComputing.",
+                    /* Mono */
+                    "MonoDevelop.NUnit"
                 };
 
             public static IEnumerable<Type> FindClassesOfTypeWithAttribute<T, TAttribute>()