diff --git a/jquery.elevatezoom.js b/jquery.elevatezoom.js
index 1813e2d..15fa7ce 100644
--- a/jquery.elevatezoom.js
+++ b/jquery.elevatezoom.js
@@ -610,7 +610,7 @@ if ( typeof Object.create !== 'function' ) {
 								lensHeight = String((self.options.zoomWindowHeight/self.heightRatio))
 							}
 
-							if(self.options.zoomWindowWidth < self.options.zoomWindowWidth){
+							if(self.nzWidth < self.options.zoomWindowHeight/self.heightRatio){
 								lensWidth = self.nzWidth;
 							}       
 							else{
@@ -1774,4 +1774,4 @@ if ( typeof Object.create !== 'function' ) {
 			onImageSwapComplete: $.noop
 	};
 
-})( jQuery, window, document );
\ No newline at end of file
+})( jQuery, window, document );