diff --git a/packages/core/package.json b/packages/core/package.json
index f86d7da..c82fa15 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -47,7 +47,7 @@
     "scripts": {
         "build": "tsc -p tsconfig.json",
         "clean": "rm -rf dist",
-        "prepublishOnly": "pnpm run clean && pnpm run build",
+        "prepublishOnly": "test -f dist/index.js && test -f dist/index.d.ts || (echo 'dist is missing build output; run pnpm build before publishing' >&2 && exit 1)",
         "test": "pnpm run build && NODE_OPTIONS=--experimental-vm-modules jest",
         "test:watch": "pnpm run build && NODE_OPTIONS=--experimental-vm-modules jest --watch"
     },
diff --git a/packages/express/package.json b/packages/express/package.json
index ff022b4..8a7df2c 100644
--- a/packages/express/package.json
+++ b/packages/express/package.json
@@ -39,7 +39,7 @@
     "build:types": "tsc -p tsconfig.build.json",
     "clean": "rm -rf dist",
     "dev": "tsc --watch",
-    "prepublishOnly": "pnpm run clean && pnpm run build",
+    "prepublishOnly": "test -f dist/index.js && test -f dist/index.d.ts || (echo 'dist is missing build output; run pnpm build before publishing' >&2 && exit 1)",
     "test": "pnpm --filter @seamless-auth/core build && pnpm run build && NODE_OPTIONS=--experimental-vm-modules jest",
     "test:watch": "pnpm --filter @seamless-auth/core build && pnpm run build && NODE_OPTIONS=--experimental-vm-modules jest --watch"
   },
diff --git a/packages/fastify/package.json b/packages/fastify/package.json
index 86840a6..405f3b3 100644
--- a/packages/fastify/package.json
+++ b/packages/fastify/package.json
@@ -39,7 +39,7 @@
     "build:types": "tsc -p tsconfig.build.json",
     "clean": "rm -rf dist",
     "dev": "tsc --watch",
-    "prepublishOnly": "pnpm run clean && pnpm run build",
+    "prepublishOnly": "test -f dist/index.js && test -f dist/index.d.ts || (echo 'dist is missing build output; run pnpm build before publishing' >&2 && exit 1)",
     "test": "pnpm --filter @seamless-auth/core build && pnpm run build && NODE_OPTIONS=--experimental-vm-modules jest",
     "test:watch": "pnpm --filter @seamless-auth/core build && pnpm run build && NODE_OPTIONS=--experimental-vm-modules jest --watch"
   },