diff --git a/lib/6to5/generation/source-map.js b/lib/6to5/generation/source-map.js
index 31fd5155a6..34f5d9d0cd 100644
--- a/lib/6to5/generation/source-map.js
+++ b/lib/6to5/generation/source-map.js
@@ -9,7 +9,8 @@ function SourceMap(position, opts, code) {
 
   if (opts.sourceMap) {
     this.map = new sourceMap.SourceMapGenerator({
-      file: opts.sourceMapName
+      file: opts.sourceMapName,
+      sourceRoot: opts.sourceRoot
     });
 
     this.map.setSourceContent(opts.sourceFileName, code);