diff --git a/packages/babel-plugin-transform-react-jsx-source/src/index.js b/packages/babel-plugin-transform-react-jsx-source/src/index.js
index ee3f8813e5..76a5cea1ee 100644
--- a/packages/babel-plugin-transform-react-jsx-source/src/index.js
+++ b/packages/babel-plugin-transform-react-jsx-source/src/index.js
@@ -50,7 +50,7 @@ export default function({ types: t }) {
       }
 
       if (!state.fileNameIdentifier) {
-        const fileName = state.file.opts.filename;
+        const fileName = state.file.opts.filename || "";
 
         const fileNameIdentifier = path.scope.generateUidIdentifier(
           FILE_NAME_VAR,