diff --git a/Gruntfile.js b/Gruntfile.js
index 73023939e8..6b35cedc28 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -112,6 +112,9 @@ module.exports = function (grunt) {
 
     less: {
       compile: {
+        options: {
+          strictMath: true
+        },
         files: {
           'dist/css/<%= pkg.name %>.css': 'less/bootstrap.less',
           'dist/css/<%= pkg.name %>-theme.css': 'less/theme.less'