diff --git a/src/sass.ts b/src/sass.ts
index dd187460..de972df7 100755
--- a/src/sass.ts
+++ b/src/sass.ts
@@ -281,7 +281,8 @@ function renderSassSuccess(context: BuildContext, sassResult: Result, sassConfig
 
     const postcssOptions: any = {
       to: basename(sassConfig.outFile),
-      map: autoPrefixerMapOptions
+      map: autoPrefixerMapOptions,
+      from: void 0
     };
 
     Logger.debug(`sass, start postcss/autoprefixer`);