diff --git a/rhodecode/lib/utils.py b/rhodecode/lib/utils.py
index 293a400e..f9180c2d 100644
--- a/rhodecode/lib/utils.py
+++ b/rhodecode/lib/utils.py
@@ -782,8 +782,10 @@ def get_custom_lexer(extension):
     from pygments import lexers
 
     # custom override made by RhodeCode
-    if extension in ["mako"]:
+    if extension.lower() in ["mako"]:
         return lexers.get_lexer_by_name("html+mako")
+    elif extension.lower() in ["jenkinsfile"]:
+        return lexers.get_lexer_by_name("groovy")
 
     # check if we didn't define this extension as other lexer
     extensions = rhodecode.EXTENSIONS and getattr(rhodecode.EXTENSIONS, "EXTRA_LEXERS", None)