diff --git a/jquery.elevatezoom.js b/jquery.elevatezoom.js
index 1813e2d..205a9f3 100644
--- a/jquery.elevatezoom.js
+++ b/jquery.elevatezoom.js
@@ -189,7 +189,7 @@ if ( typeof Object.create !== 'function' ) {
 
 					// adjust images less than the window height
 
-					if(self.nzHeight < self.options.zoomWindowWidth/self.widthRatio){
+					if(self.nzHeight < self.options.zoomWindowHeight/self.heightRatio){
 						lensHeight = self.nzHeight;              
 					}
 					else{
@@ -1774,4 +1774,4 @@ if ( typeof Object.create !== 'function' ) {
 			onImageSwapComplete: $.noop
 	};
 
-})( jQuery, window, document );
\ No newline at end of file
+})( jQuery, window, document );