diff --git a/packages/react-router-config/jest.config.js b/packages/react-router-config/jest.config.js
index e2accae217..c3a7915b99 100644
--- a/packages/react-router-config/jest.config.js
+++ b/packages/react-router-config/jest.config.js
@@ -7,7 +7,7 @@ switch (process.env.TEST_ENV) {
     mappedModule = "<rootDir>/umd/react-router-config.js";
     break;
   default:
-    mappedModule = "<rootDir>/modules/index";
+    mappedModule = "<rootDir>/modules/index.js";
 }
 
 module.exports = {
diff --git a/packages/react-router-dom/.size-snapshot.json b/packages/react-router-dom/.size-snapshot.json
index e9eda53a06..f350e4a180 100644
--- a/packages/react-router-dom/.size-snapshot.json
+++ b/packages/react-router-dom/.size-snapshot.json
@@ -14,13 +14,13 @@
     }
   },
   "umd/react-router-dom.js": {
-    "bundled": 159681,
+    "bundled": 159709,
     "minified": 57597,
-    "gzipped": 16538
+    "gzipped": 16540
   },
   "umd/react-router-dom.min.js": {
-    "bundled": 97431,
-    "minified": 34632,
-    "gzipped": 10211
+    "bundled": 97476,
+    "minified": 34651,
+    "gzipped": 10216
   }
 }
diff --git a/packages/react-router-dom/jest.config.js b/packages/react-router-dom/jest.config.js
index 9515b9282a..e94b5a03ff 100644
--- a/packages/react-router-dom/jest.config.js
+++ b/packages/react-router-dom/jest.config.js
@@ -7,7 +7,7 @@ switch (process.env.TEST_ENV) {
     mappedModule = "<rootDir>/umd/react-router-dom.js";
     break;
   default:
-    mappedModule = "<rootDir>/modules/index";
+    mappedModule = "<rootDir>/modules/index.js";
 }
 
 module.exports = {
diff --git a/packages/react-router-dom/rollup.config.js b/packages/react-router-dom/rollup.config.js
index 5396c069f9..c7781aef06 100644
--- a/packages/react-router-dom/rollup.config.js
+++ b/packages/react-router-dom/rollup.config.js
@@ -21,7 +21,10 @@ const babelOptionsESM = {
   plugins: [["@babel/transform-runtime", { useESModules: true }]]
 };
 const commonjsOptions = {
-  include: /node_modules/
+  include: /node_modules/,
+  namedExports: {
+    "../react-router/node_modules/react-is/index.js": ["isValidElementType"]
+  }
 };
 
 const external = id => !id.startsWith(".") && !id.startsWith("/");
diff --git a/packages/react-router/.size-snapshot.json b/packages/react-router/.size-snapshot.json
index cd47747112..cc5cce3239 100644
--- a/packages/react-router/.size-snapshot.json
+++ b/packages/react-router/.size-snapshot.json
@@ -1,8 +1,8 @@
 {
   "esm/react-router.js": {
-    "bundled": 24714,
-    "minified": 14466,
-    "gzipped": 3780,
+    "bundled": 24721,
+    "minified": 14469,
+    "gzipped": 3778,
     "treeshaked": {
       "rollup": {
         "code": 4464,
@@ -14,13 +14,13 @@
     }
   },
   "umd/react-router.js": {
-    "bundled": 99917,
+    "bundled": 99946,
     "minified": 35992,
     "gzipped": 11338
   },
   "umd/react-router.min.js": {
-    "bundled": 63384,
-    "minified": 22374,
-    "gzipped": 7857
+    "bundled": 63430,
+    "minified": 22393,
+    "gzipped": 7861
   }
 }
diff --git a/packages/react-router/jest.config.js b/packages/react-router/jest.config.js
index dd6db748d9..09b538358c 100644
--- a/packages/react-router/jest.config.js
+++ b/packages/react-router/jest.config.js
@@ -7,7 +7,7 @@ switch (process.env.TEST_ENV) {
     mappedModule = "<rootDir>/umd/react-router.js";
     break;
   default:
-    mappedModule = "<rootDir>/modules/index";
+    mappedModule = "<rootDir>/modules/index.js";
 }
 
 module.exports = {
diff --git a/packages/react-router/modules/Route.js b/packages/react-router/modules/Route.js
index 9ecba7e9d1..3493a67ff8 100644
--- a/packages/react-router/modules/Route.js
+++ b/packages/react-router/modules/Route.js
@@ -1,5 +1,5 @@
 import React from "react";
-import ReactIs from "react-is";
+import { isValidElementType } from "react-is";
 import PropTypes from "prop-types";
 import invariant from "tiny-invariant";
 import warning from "tiny-warning";
@@ -128,8 +128,8 @@ if (!React.createContext) {
 if (__DEV__) {
   Route.propTypes = {
     children: PropTypes.oneOfType([PropTypes.func, PropTypes.node]),
-    component: function(props, propName) {
-      if (props[propName] && !ReactIs.isValidElementType(props[propName])) {
+    component: (props, propName) => {
+      if (props[propName] && !isValidElementType(props[propName])) {
         return new Error(
           `Invalid prop 'component' supplied to 'Route': the prop is not a valid React component`
         );
diff --git a/packages/react-router/rollup.config.js b/packages/react-router/rollup.config.js
index 28181feccf..50f6f0a419 100644
--- a/packages/react-router/rollup.config.js
+++ b/packages/react-router/rollup.config.js
@@ -21,7 +21,10 @@ const babelOptionsESM = {
   plugins: [["@babel/transform-runtime", { useESModules: true }]]
 };
 const commonjsOptions = {
-  include: /node_modules/
+  include: /node_modules/,
+  namedExports: {
+    "node_modules/react-is/index.js": ["isValidElementType"]
+  }
 };
 
 const external = id => !id.startsWith(".") && !id.startsWith("/");