1 files changed, 1 insertions, 1 deletions

diff --git a/src/fns.c b/src/fns.c
index 10997da0d46..7d120a90f78 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -718,7 +718,7 @@ concat (ptrdiff_t nargs, Lisp_Object *args,
     val = make_uninit_string (result_len);
 
   /* In `append', if all but last arg are nil, return last arg.  */
-  if (target_type == Lisp_Cons && EQ (val, Qnil))
+  if (target_type == Lisp_Cons && NILP (val))
     return last_tail;
 
   /* Copy the contents of the args into the result.  */