diff --git a/which-key.el b/which-key.el
index 55767a97f69..8b4c60fdee8 100644
--- a/which-key.el
+++ b/which-key.el
@@ -840,6 +840,7 @@ problems at github. If DISABLE is non-nil disable support."
       (setq-local cursor-type nil)
       (setq-local cursor-in-non-selected-windows nil)
       (setq-local mode-line-format nil)
+      (setq-local header-line-format nil)
       (setq-local word-wrap nil)
       (setq-local show-trailing-whitespace nil)
       (run-hooks 'which-key-init-buffer-hook))))