diff --git a/packages/react-scripts/config/paths.js b/packages/react-scripts/config/paths.js
index 45033e93..57ddcdcb 100644
--- a/packages/react-scripts/config/paths.js
+++ b/packages/react-scripts/config/paths.js
@@ -93,6 +93,7 @@ module.exports = {
   appWebBuild: useNodeEnv ? resolveApp('build/web') : resolveApp('build'),
   appPublic: resolveApp('public'),
   appHtml: resolveApp('public/index.html'),
+  appIndexJs: resolveApp('src/index'),
   appWebIndexJs: webIndexJs,
   appNodeIndexJs: useNodeEnv && nodeIndexJs,
   appPackageJson: resolveApp('package.json'),
@@ -122,6 +123,7 @@ module.exports = {
   appWebBuild: useNodeEnv ? resolveApp('build/web') : resolveApp('build'),
   appPublic: resolveApp('public'),
   appHtml: resolveApp('public/index.html'),
+  appIndexJs: resolveApp('src/index'),
   appWebIndexJs: webIndexJs,
   appNodeIndexJs: useNodeEnv && nodeIndexJs,
   appPackageJson: resolveApp('package.json'),
@@ -179,6 +181,7 @@ if (
       : resolveOwn('../../build'),
     appPublic: resolveOwn('template/public'),
     appHtml: resolveOwn('template/public/index.html'),
+    appIndexJs: resolveApp('src/index'),
     appWebIndexJs: webIndexJs,
     appNodeIndexJs: useNodeEnv && nodeIndexJs,
     appPackageJson: resolveOwn('package.json'),