diff --git a/source/Ox.UI/js/Panel/SplitPanel.js b/source/Ox.UI/js/Panel/SplitPanel.js
index 8115f96f..ae85ed4a 100644
--- a/source/Ox.UI/js/Panel/SplitPanel.js
+++ b/source/Ox.UI/js/Panel/SplitPanel.js
@@ -131,7 +131,7 @@ Ox.SplitPanel = function(options, self) {
         elementIndices.forEach(function(elementIndex, index) {
             self.$elements[elementIndex].css(
                 index == 0 ? dimension : edge,
-                index == 0 ? size : size + 1
+                (index == 0 ? size : size + 1) + 'px'
             );
         });
     }