diff --git a/packages/angular_devkit/build_angular/src/webpack/configs/styles.ts b/packages/angular_devkit/build_angular/src/webpack/configs/styles.ts
index 76288114982b..3efc04a38273 100644
--- a/packages/angular_devkit/build_angular/src/webpack/configs/styles.ts
+++ b/packages/angular_devkit/build_angular/src/webpack/configs/styles.ts
@@ -129,6 +129,7 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
             implementation: require('less'),
             sourceMap: cssSourceMap,
             lessOptions: {
+              math: 'always',
               javascriptEnabled: true,
               paths: includePaths,
             },