diff --git a/rc/mime.kak b/rc/mime.kak
index e0801a18..2e14bd2c 100644
--- a/rc/mime.kak
+++ b/rc/mime.kak
@@ -1,5 +1,5 @@
 decl str mimetype "text/plain"
 
 hook global BufOpen .* %{
-     set buffer mimetype %sh{file -b --mime-type ${kak_bufname} }
+     set buffer mimetype %sh{file -b --mime-type ${kak_buffile} }
 }