diff --git a/packages/react-scripts/config/env.js b/packages/react-scripts/config/env.js
index fa42747f6a8..c92481e69fb 100644
--- a/packages/react-scripts/config/env.js
+++ b/packages/react-scripts/config/env.js
@@ -82,6 +82,7 @@ function getClientEnvironment(publicUrl) {
         // This should only be used as an escape hatch. Normally you would put
         // images into the `src` and `import` them in code to get their paths.
         PUBLIC_URL: publicUrl,
+        PLATFORM: 'web',
       }
     );
   // Stringify all values so we can feed into Webpack DefinePlugin