diff --git a/Gruntfile.js b/Gruntfile.js
index 01280f1026a1853a70052770c5ef995a79f2799a..b0c295e141a519b90e65795c0aa10d2cf4fd0f88 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -150,7 +150,13 @@ module.exports = function(grunt) {
               pattern: '$brand-primary: #619144 !default;',
               replacement: '$brand-primary: #619144;',
               order: 4
-            }
+            },
+			// Wrap calcs in {}
+            {
+              pattern: /calc\((\$[^ ]+)/g,
+              replacement: 'calc(#{$1}',
+              order: 5
+            },
           ]
         }
       }