diff --git a/lisp/help.el b/lisp/help.el
index 1d87c2209c8..a06679b31f5 100644
--- a/lisp/help.el
+++ b/lisp/help.el
@@ -2262,8 +2262,13 @@ The `temp-buffer-window-setup-hook' hook is called."
   "Display the output of a non-nil `help-form'."
   (let ((msg (eval help-form t)))
     (if (stringp msg)
-	(with-output-to-temp-buffer " *Char Help*"
-	  (princ msg)))))
+	(let ((bufname " *Char Help*"))
+          (with-output-to-temp-buffer bufname)
+          ;; Use `insert' instead of `princ' so that keys in `help-form'
+          ;; are displayed with `help-key-binding' face (bug#77118).
+          (with-current-buffer bufname
+            (let (buffer-read-only)
+              (insert msg)))))))
 
 (defun help--append-keystrokes-help (str)
   (let* ((keys (this-single-command-keys))