diff --git a/src/evalfunc.c b/src/evalfunc.c
index 8c27986..0e071d8 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -3920,7 +3920,7 @@
     static void
 f_did_filetype(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
 {
-    rettv->vval.v_number = did_filetype;
+    rettv->vval.v_number = curbuf->b_did_filetype;
 }
 
 /*