diff --git a/collects/framework/private/panel.ss b/collects/framework/private/panel.ss
index bc85c239..aaa47e4e 100644
--- a/collects/framework/private/panel.ss
+++ b/collects/framework/private/panel.ss
@@ -182,14 +182,14 @@
       ;; type percentage : (make-percentage number)
       (define-struct percentage (%))
       
-      (define dragable<%>
+      (define vertical-dragable<%>
         (interface ((class->interface vertical-panel%))
           after-percentage-change
           set-percentages
           get-percentages))
 
       (define vertical-dragable-mixin
-        (mixin ((class->interface vertical-panel%)) (dragable<%>)
+        (mixin ((class->interface vertical-panel%)) (vertical-dragable<%>)
           (init parent)
           (super-instantiate (parent))
           (inherit get-client-size container-flow-modified)
diff --git a/collects/framework/private/sig.ss b/collects/framework/private/sig.ss
index c36353bc..f6dfaedb 100644
--- a/collects/framework/private/sig.ss
+++ b/collects/framework/private/sig.ss
@@ -53,6 +53,7 @@
      single-pane%
      ;;multi-view%
 
+     vertical-dragable<%>
      vertical-dragable-mixin
      vertical-dragable%))