diff --git a/examples/useContext.html b/examples/useContext.html
index 2e736c377..e7213e10d 100644
--- a/examples/useContext.html
+++ b/examples/useContext.html
@@ -49,8 +49,8 @@
         if (!BI.isNumber(pix)) {
             return pix;
         }
-        return `calc(var(--css-scale) * ${pix}px - ${border || 0}})`;
-    }
+        return "calc(var(--css-scale) * " + pix + "px)";
+    };
 
     var Child = BI.inherit(BI.Widget, {
         render: function () {