diff --git a/src/optionstr.c b/src/optionstr.c
index e5f4946..45f126f 100644
--- a/src/optionstr.c
+++ b/src/optionstr.c
@@ -4332,7 +4332,7 @@
     secure = 0;
 
     ++ft_recursive;
-    did_filetype = TRUE;
+    curbuf->b_did_filetype = TRUE;
     // Only pass TRUE for "force" when the value changed or not
     // used recursively, to avoid endless recurrence.
     apply_autocmds(EVENT_FILETYPE, curbuf->b_p_ft, curbuf->b_fname,