diff --git a/source/Ox.UI/js/Panel/SplitPanel.js b/source/Ox.UI/js/Panel/SplitPanel.js
index 3be3bf13..8115f96f 100644
--- a/source/Ox.UI/js/Panel/SplitPanel.js
+++ b/source/Ox.UI/js/Panel/SplitPanel.js
@@ -68,9 +68,9 @@ Ox.SplitPanel = function(options, self) {
         }, element);
         // top and bottom (horizontal) or left and right (vertical)
         self.edges.slice(2).forEach(function(edge) {
-            if (!element.element.css(edge)) {
-                element.element.css(edge, 0);
-            }
+            element.element.css(
+                edge, (parseInt(element.element.css(edge)) || 0) + 'px'
+            );
         });
         if (element.collapsed) {
             // left/right (horizontal) or top/bottom (vertical)