diff --git a/ftypes.go b/ftypes.go
index 13b994340cb4cb2cc2ee2785dfaa412412162401..145391df5b5a959807902bfd68b4e5ea2f0aee4e 100644
--- a/ftypes.go
+++ b/ftypes.go
@@ -144,7 +144,7 @@ 		TabWidth:   Config.DefaultTabWidth,
 	},
 	{
 		Name:       "Makefile",
-		Extensions: []string{".make", "Makefile"},
+		Extensions: []string{".make", "Makefile", "makefile"},
 		UseTabs:    true,
 		Comment:    "#",
 		TabWidth:   Config.DefaultTabWidth,