diff --git a/ui/jquery.ui.effect-drop.js b/ui/jquery.ui.effect-drop.js
index 3246c09b0c..674ef41ecc 100644
--- a/ui/jquery.ui.effect-drop.js
+++ b/ui/jquery.ui.effect-drop.js
@@ -32,7 +32,7 @@ $.effects.effect.drop = function( o, done ) {
 	el.show();
 	$.effects.createWrapper( el );
 
-	distance = o.distance || el[ ref === "top" ? "outerHeight": "outerWidth" ]({ margin: true }) / 2;
+	distance = o.distance || el[ ref === "top" ? "outerHeight": "outerWidth" ]( true ) / 2;
 
 	if ( show ) {
 		el