diff --git a/lib/makeWebpackConfig.js b/lib/makeWebpackConfig.js
index 98698e16..2442304b 100644
--- a/lib/makeWebpackConfig.js
+++ b/lib/makeWebpackConfig.js
@@ -30,7 +30,8 @@ module.exports = async (playroomConfig, options) => {
       }
     );
     const { version } = JSON.parse(pkgContents);
-    isLegacyReact = !(version.startsWith('18') || version.startsWith('0.0.0'));
+    const majorVersion = Number(version.split('.')[0]);
+    isLegacyReact = !(majorVersion >= 18 || version.startsWith('0.0.0'));
   } catch (e) {
     throw new Error('Unable to read `react-dom` package json');
   }