diff --git a/util/file_types.py b/util/file_types.py
index 14d198bd6..57194c1c8 100644
--- a/util/file_types.py
+++ b/util/file_types.py
@@ -30,6 +30,7 @@ lang_types = {
     '.el'    : "lisp",
     '.txt'   : "text",
     '.tex'   : "tex",
+    '.mk'    : "make",
     }
 
 # languages based on file prefix