diff --git a/lisp/ibuf-ext.el b/lisp/ibuf-ext.el
index 95ff014aa5b..33b68b96ff2 100644
--- a/lisp/ibuf-ext.el
+++ b/lisp/ibuf-ext.el
@@ -594,22 +594,16 @@ To evaluate a form without viewing the buffer, see `ibuffer-do-eval'."
    :modifier-p :maybe)
   (revert-buffer t t))
 
-;;;###autoload (autoload 'ibuffer-do-isearch "ibuf-ext")
-(define-ibuffer-op ibuffer-do-isearch ()
+;;;###autoload
+(defun ibuffer-do-isearch ()
   "Perform a `isearch-forward' in marked buffers."
-  (:interactive ()
-   :opstring "searched in"
-   :complex t
-   :modifier-p :maybe)
+  (interactive "" ibuffer-mode)
   (multi-isearch-buffers (ibuffer-get-marked-buffers)))
 
-;;;###autoload (autoload 'ibuffer-do-isearch-regexp "ibuf-ext")
-(define-ibuffer-op ibuffer-do-isearch-regexp ()
+;;;###autoload
+(defun ibuffer-do-isearch-regexp ()
   "Perform a `isearch-forward-regexp' in marked buffers."
-  (:interactive ()
-   :opstring "searched regexp in"
-   :complex t
-   :modifier-p :maybe)
+  (interactive "" ibuffer-mode)
   (multi-isearch-buffers-regexp (ibuffer-get-marked-buffers)))
 
 ;;;###autoload (autoload 'ibuffer-do-replace-regexp "ibuf-ext")