diff --git a/test/tests/operations/StrUtils.js b/test/tests/operations/StrUtils.js
index 1450d1ba..478ab1f3 100644
--- a/test/tests/operations/StrUtils.js
+++ b/test/tests/operations/StrUtils.js
@@ -26,7 +26,7 @@ TestRegister.addTests([
     {
         name: "Diff, basic usage",
         input: "testing23\n\ntesting123",
-        expectedOutput: "testing<span class='hlgreen'>1</span>23",
+        expectedOutput: "testing<span class='hl5'>1</span>23",
         recipeConfig: [
             {
                 "op": "Diff",