diff --git a/contrib/walker/walker.lisp b/contrib/walker/walker.lisp
index 17cde1b..76a9f7f 100644
--- a/contrib/walker/walker.lisp
+++ b/contrib/walker/walker.lisp
@@ -296,6 +296,16 @@
          :type implict-progn-form
          :reader ast-body)))
 
+(defclass defun-form (ast)
+  ((name :initarg :name
+         :type variable-symbol
+         :reader ast-name)
+   (lambda-list :initarg :lambda-list
+                :reader ast-lambda-list)
+   (body :initarg :body
+         :type implict-progn-form
+         :reader ast-body)))
+
 ;; walker
 (defclass walker () ())
 
@@ -730,6 +740,20 @@
          (walk-form walker (first form) form env path))))
 
 
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defmethod walk-form ((walker walker) (name (eql 'defun)) form env path)
+  (with-walker-bindings (name lambda-list &body body) (rest form)
+    (multiple-value-bind (lambda-list env)
+        (walk-lambda-list walker lambda-list env (cons 2 path))
+      (make-instance 'defun-form
+                     :name name
+                     :lambda-list lambda-list
+                     :body (make-instance 'implict-progn-form
+                                          :path (cons 3 path)
+                                          :forms (walk-forms walker body env path 3))
+                     :path (cons 0 path)))))
+
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 (defgeneric visit (visitor ast))
@@ -853,6 +877,11 @@
 (defmethod visit (visitor (ast macrolet-form))
   (visit visitor (ast-body ast)))
 
+(defmethod visit (visitor (ast defun-form))
+  (visit visitor (ast-lambda-list ast))
+  (visit visitor (ast-body ast)))
+
+;;
 (define-condition exit-visitor ()
   ((value :initarg :value
           :reader exit-visitor-value)))