diff --git a/src/sly.js b/src/sly.js
index 1cd77a5..3260b34 100644
--- a/src/sly.js
+++ b/src/sly.js
@@ -210,7 +210,7 @@
 					// Item
 					var $item = $(element);
 					var rect = element.getBoundingClientRect();
-					var itemSize = round(o.horizontal ? rect.width || rect.right - rect.left : rect.height || rect.bottom - rect.top);
+					var itemSize = Math.ceil(o.horizontal ? rect.width || rect.right - rect.left : rect.height || rect.bottom - rect.top);
 					var itemMarginStart = getPx($item, o.horizontal ? 'marginLeft' : 'marginTop');
 					var itemMarginEnd = getPx($item, o.horizontal ? 'marginRight' : 'marginBottom');
 					var itemSizeFull = itemSize + itemMarginStart + itemMarginEnd;