diff --git a/packages/babel-core/src/transformation/file/index.js b/packages/babel-core/src/transformation/file/index.js
index 80c4365e32..aadd230773 100644
--- a/packages/babel-core/src/transformation/file/index.js
+++ b/packages/babel-core/src/transformation/file/index.js
@@ -362,7 +362,7 @@ export default class File extends Store {
 
       inputMapConsumer.eachMapping(function (mapping) {
         mergedGenerator.addMapping({
-          source: inputMapConsumer.file,
+          source: mapping.source,
 
           original: {
             line: mapping.originalLine,