diff --git a/slate.js b/slate.js
index 2dec1a5..c65df52 100644
--- a/slate.js
+++ b/slate.js
@@ -5,7 +5,7 @@ var pushLeftHalf = slate.operation("push", {
 
 var pushLeftThird = slate.operation("push", {
   "direction" : "left",
-  "style" : "bar-resize:screenSizeX/3"
+  "style" : "bar-resize:2 * screenSizeX/3"
 });
 
 var pushRightHalf = slate.operation("push", {