diff --git a/src/web/mod_http_fileserver.erl b/src/web/mod_http_fileserver.erl
index a0c14964f..ff101755f 100644
--- a/src/web/mod_http_fileserver.erl
+++ b/src/web/mod_http_fileserver.erl
@@ -118,7 +118,7 @@ log(File, Code, Request) ->
 	      [IP, Day, Month, Year, Hour, Minute, Second, Request#request.method, Path, Query, Code]).
 
 content_type(Filename) ->
-    case httpd_util:to_lower(filename:extension(Filename)) of
+    case string:to_lower(filename:extension(Filename)) of
         ".jpg"  -> "image/jpeg";
         ".jpeg" -> "image/jpeg";
         ".gif"  -> "image/gif";