1 files changed, 3 insertions, 2 deletions

diff --git a/src/window.c b/src/window.c
index 81578375498..3802efb992a 100644
--- a/src/window.c
+++ b/src/window.c
@@ -5534,13 +5534,14 @@ window_wants_header_line (struct window *w)
     = window_parameter (w, Qheader_line_format);
 
   struct frame *f = WINDOW_XFRAME (w);
+  Lisp_Object wbuffer = WINDOW_BUFFER (w);
 
-  return (WINDOW_LEAF_P (w)
+  return (BUFFERP (wbuffer)
           && !MINI_WINDOW_P (w)
           && !WINDOW_PSEUDO_P (w)
           && !EQ (window_header_line_format, Qnone)
           && (!null_header_line_format (window_header_line_format, f)
-              || !null_header_line_format (BVAR (XBUFFER (WINDOW_BUFFER (w)),
+              || !null_header_line_format (BVAR (XBUFFER (wbuffer),
                                                  header_line_format), f))
           && (WINDOW_PIXEL_HEIGHT (w)
               > (window_wants_mode_line (w)