diff --git a/lisp/ido.el b/lisp/ido.el
index e52a753..de12c8a 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -2011,11 +2011,12 @@ If INITIAL is non-nil, it specifies the initial input string."
 	(setq ido-exit nil)
 	(setq ido-final-text
 	      (catch 'ido
-		(completing-read
-		 (ido-make-prompt item prompt)
-		 '(("dummy" . 1)) nil nil ; table predicate require-match
-		 (prog1 ido-text-init (setq ido-text-init nil))	;initial-contents
-		 history))))
+		(let ((completing-read-function nil))
+		  (completing-read
+		   (ido-make-prompt item prompt)
+		   '(("dummy" . 1)) nil nil ; table predicate require-match
+		   (prog1 ido-text-init (setq ido-text-init nil)) ;initial-contents
+		   history)))))
       (ido-trace "completing-read" ido-final-text)
       (if (get-buffer ido-completion-buffer)
 	  (kill-buffer ido-completion-buffer))
@@ -4835,7 +4836,7 @@ See `read-directory-name' for additional parameters."
 	  (concat ido-current-directory filename)))))
 
 ;;;###autoload
-(defun ido-completing-read (prompt choices &optional predicate require-match initial-input hist def)
+(defun ido-completing-read (prompt choices &optional predicate require-match initial-input hist def inherit-input-method)
   "Ido replacement for the built-in `completing-read'.
 Read a string in the minibuffer with ido-style completion.
 PROMPT is a string to prompt with; normally it ends in a colon and a space.
diff --git a/src/minibuf.c b/src/minibuf.c
index 564346f..930d50f 100644
--- a/src/minibuf.c
+++ b/src/minibuf.c
@@ -132,6 +132,7 @@ Lisp_Object Vminibuffer_completion_table, Qminibuffer_completion_table;
 Lisp_Object Vminibuffer_completion_predicate, Qminibuffer_completion_predicate;
 Lisp_Object Vminibuffer_completion_confirm, Qminibuffer_completion_confirm;
 Lisp_Object Vminibuffer_completing_file_name;
+Lisp_Object Vcompleting_read_function;
 
 Lisp_Object Quser_variable_p;
 
@@ -1721,6 +1722,9 @@ with a space are ignored unless STRING itself starts with a space.  */)
 
 DEFUN ("completing-read", Fcompleting_read, Scompleting_read, 2, 8, 0,
        doc: /* Read a string in the minibuffer, with completion.
+If `completing-read-function' is non-nil, call it with all arguments passed
+to `completing-read'.
+
 PROMPT is a string to prompt with; normally it ends in a colon and a space.
 COLLECTION can be a list of strings, an alist, an obarray or a hash table.
 COLLECTION can also be a function to do the completion itself.
@@ -1779,9 +1783,25 @@ Completion ignores case if the ambient value of
      Lisp_Object hist, def, inherit_input_method;
 {
   Lisp_Object val, histvar, histpos, position;
+  Lisp_Object args[9];
   Lisp_Object init;
   int pos = 0;
   int count = SPECPDL_INDEX ();
+
+  if (! NILP (Vcompleting_read_function))
+    {
+      args[0] = Vcompleting_read_function;
+      args[1] = prompt;
+      args[2] = collection;
+      args[3] = predicate;
+      args[4] = require_match;
+      args[5] = initial_input;
+      args[6] = hist;
+      args[7] = def;
+      args[8] = inherit_input_method;
+      return Ffuncall (9, args);
+    }
+
   struct gcpro gcpro1;
 
   init = initial_input;
@@ -2216,6 +2236,12 @@ If the value is `confirm-after-completion', the user may exit with an
 	       doc: /* Non-nil means completing file names.  */);
   Vminibuffer_completing_file_name = Qnil;
 
+  DEFVAR_LISP ("completing-read-function",
+               &Vcompleting_read_function,
+               doc: /* Non-nil means `completing-read' does its work by calling this function.
+The function will receive all arguments passed to `completing-read'.  */);
+  Vcompleting_read_function = Qnil;
+
   DEFVAR_LISP ("minibuffer-help-form", &Vminibuffer_help_form,
 	       doc: /* Value that `help-form' takes on inside the minibuffer.  */);
   Vminibuffer_help_form = Qnil;