diff --git a/packages/babel-preset-es2016/package.json b/packages/babel-preset-es2016/package.json
index 6ff9c9120f..b9c94f87f6 100644
--- a/packages/babel-preset-es2016/package.json
+++ b/packages/babel-preset-es2016/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-es2016",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-transform-exponentiation-operator": "^6.3.13"
   }
diff --git a/packages/babel-preset-es2016/index.js b/packages/babel-preset-es2016/src/index.js
similarity index 100%
rename from packages/babel-preset-es2016/index.js
rename to packages/babel-preset-es2016/src/index.js
diff --git a/packages/babel-preset-es2017/package.json b/packages/babel-preset-es2017/package.json
index ace2b58312..f66c70526f 100644
--- a/packages/babel-preset-es2017/package.json
+++ b/packages/babel-preset-es2017/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-es2017",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-syntax-trailing-function-commas": "^6.8.0",
     "babel-plugin-transform-async-to-generator": "^6.8.0"
diff --git a/packages/babel-preset-es2017/index.js b/packages/babel-preset-es2017/src/index.js
similarity index 100%
rename from packages/babel-preset-es2017/index.js
rename to packages/babel-preset-es2017/src/index.js
diff --git a/packages/babel-preset-react/package.json b/packages/babel-preset-react/package.json
index 408f75ea27..97e1ccb457 100644
--- a/packages/babel-preset-react/package.json
+++ b/packages/babel-preset-react/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-react",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-syntax-flow": "^6.3.13",
     "babel-plugin-syntax-jsx": "^6.3.13",
diff --git a/packages/babel-preset-react/index.js b/packages/babel-preset-react/src/index.js
similarity index 100%
rename from packages/babel-preset-react/index.js
rename to packages/babel-preset-react/src/index.js
diff --git a/packages/babel-preset-stage-0/package.json b/packages/babel-preset-stage-0/package.json
index 575f3d959f..3b86680069 100644
--- a/packages/babel-preset-stage-0/package.json
+++ b/packages/babel-preset-stage-0/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-stage-0",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-transform-do-expressions": "^6.3.13",
     "babel-plugin-transform-function-bind": "^6.3.13",
diff --git a/packages/babel-preset-stage-0/index.js b/packages/babel-preset-stage-0/src/index.js
similarity index 100%
rename from packages/babel-preset-stage-0/index.js
rename to packages/babel-preset-stage-0/src/index.js
diff --git a/packages/babel-preset-stage-1/package.json b/packages/babel-preset-stage-1/package.json
index 7d02e52a94..df2ed803ad 100644
--- a/packages/babel-preset-stage-1/package.json
+++ b/packages/babel-preset-stage-1/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-stage-1",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-transform-class-constructor-call": "^6.3.13",
     "babel-plugin-transform-export-extensions": "^6.3.13",
diff --git a/packages/babel-preset-stage-1/index.js b/packages/babel-preset-stage-1/src/index.js
similarity index 100%
rename from packages/babel-preset-stage-1/index.js
rename to packages/babel-preset-stage-1/src/index.js
diff --git a/packages/babel-preset-stage-2/package.json b/packages/babel-preset-stage-2/package.json
index d0d1c1ff6a..22e8e0dc36 100644
--- a/packages/babel-preset-stage-2/package.json
+++ b/packages/babel-preset-stage-2/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-stage-2",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-transform-class-properties": "^6.3.13",
     "babel-plugin-transform-decorators": "^6.13.0",
diff --git a/packages/babel-preset-stage-2/index.js b/packages/babel-preset-stage-2/src/index.js
similarity index 100%
rename from packages/babel-preset-stage-2/index.js
rename to packages/babel-preset-stage-2/src/index.js
diff --git a/packages/babel-preset-stage-3/package.json b/packages/babel-preset-stage-3/package.json
index 94d256c1fd..b75506a1a0 100644
--- a/packages/babel-preset-stage-3/package.json
+++ b/packages/babel-preset-stage-3/package.json
@@ -6,7 +6,7 @@
   "homepage": "https://babeljs.io/",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-stage-3",
-  "main": "index.js",
+  "main": "lib/index.js",
   "dependencies": {
     "babel-plugin-syntax-trailing-function-commas": "^6.3.13",
     "babel-plugin-transform-async-to-generator": "^6.3.13",
diff --git a/packages/babel-preset-stage-3/index.js b/packages/babel-preset-stage-3/src/index.js
similarity index 100%
rename from packages/babel-preset-stage-3/index.js
rename to packages/babel-preset-stage-3/src/index.js