diff --git a/src/Umbraco.Web/Search/UmbracoTreeSearcher.cs b/src/Umbraco.Web/Search/UmbracoTreeSearcher.cs
index 8f977aab77..c3ab7318a0 100644
--- a/src/Umbraco.Web/Search/UmbracoTreeSearcher.cs
+++ b/src/Umbraco.Web/Search/UmbracoTreeSearcher.cs
@@ -139,7 +139,7 @@ namespace Umbraco.Web.Search
             // then nodeName will be matched normally with wildcards
             // the rest will be normal without wildcards
 
-            var allLangs = _languageService.GetAllLanguages().Select(x => x.IsoCode).ToList();
+            var allLangs = _languageService.GetAllLanguages().Select(x => x.IsoCode.ToLowerInvariant()).ToList();
 
             //check if text is surrounded by single or double quotes, if so, then exact match
             var surroundedByQuotes = Regex.IsMatch(query, "^\".*?\"$")