diff --git a/src/prepareManifest.mjs b/src/prepareManifest.mjs
index d7005b6..03280f6 100644
--- a/src/prepareManifest.mjs
+++ b/src/prepareManifest.mjs
@@ -41,6 +41,7 @@ if (manifest.esmodules) {
 
 // Remove dev flags
 console.log(`Cleaning up flags`);
+delete manifest.flags?.inDev;
 delete manifest.flags?.hotReload;
 if (Object.keys(manifest.flags).length === 0) {
 	delete manifest.flags;