diff --git a/d3pie/d3pie.js b/d3pie/d3pie.js
index 401d320..e8adfcf 100644
--- a/d3pie/d3pie.js
+++ b/d3pie/d3pie.js
@@ -1487,7 +1487,7 @@ var segments = {
 		}
 		pie.isOpeningSegment = true;
 
-		segments.maybeCloseOpenSegment();
+		segments.maybeCloseOpenSegment(pie);
 
 		d3.select(segment).transition()
 			.ease(segments.effectMap[pie.options.effects.pullOutSegmentOnClick.effect])
@@ -1508,7 +1508,7 @@ var segments = {
 			});
 	},
 
-    maybeCloseOpenSegment: function() {
+    maybeCloseOpenSegment: function(pie) {
         if (d3.selectAll("." + pie.cssPrefix + "expanded").size() > 0) {
             segments.closeSegment(pie, d3.select("." + pie.cssPrefix + "expanded").node());
         }