diff --git a/lisp/transient.el b/lisp/transient.el
index e0efe70..b67e91d 100644
--- a/lisp/transient.el
+++ b/lisp/transient.el
@@ -4476,7 +4476,7 @@ search instead."
                   2)
             lisp-imenu-generic-expression :test #'equal)
 
-(declare-function which-key-mode "which-key" (&optional arg))
+(declare-function which-key-mode "ext:which-key" (&optional arg))
 
 (defun transient--suspend-which-key-mode ()
   (when (bound-and-true-p which-key-mode)