diff --git a/scripts/postinstall.js b/scripts/postinstall.js
index f36bd39..49b0ceb 100644
--- a/scripts/postinstall.js
+++ b/scripts/postinstall.js
@@ -5,16 +5,26 @@ const util = require('util');
 const exec = util.promisify(require('child_process').exec);
 const { short } = require('leeks.js');
 
+const fallback = { prisma: './node_modules/prisma/build/index.js' };
+
 function log(...strings) {
 	console.log(short('&9[postinstall]&r'), ...strings);
 }
 
 async function npx(cmd) {
+	const parts = cmd.split(' ');
+	// fallback for environments with no symlink/npx support (PebbleHost)
+	if (!fs.existsSync(`./node_modules/.bin/${parts[0]}`)) {
+		const x = parts.shift();
+		cmd = 'node ' + fallback[x] + ' ' + parts.join(' ');
+	} else {
+		cmd = 'npx ' + cmd;
+	}
 	log(`> ${cmd}`);
 	const {
 		stderr,
 		stdout,
-	} = await exec('npx ' + cmd);
+	} = await exec(cmd);
 	if (stdout) console.log(stdout.toString());
 	if (stderr) console.log(stderr.toString());
 }
@@ -32,11 +42,17 @@ if (!providers.includes(provider)) throw new Error(`DB_PROVIDER must be one of:
 log(`provider=${provider}`);
 log(`copying ${provider} schema & migrations`);
 
-if (!fs.existsSync('./prisma')) fs.mkdirSync('./prisma');
+if (fs.existsSync('./prisma')) {
+	fs.rmSync('./prisma', {
+		force: true,
+		recursive: true,
+	});
+} else {
+	fs.mkdirSync('./prisma');
+}
 fs.copySync(`./db/${provider}`, './prisma'); // copy schema & migrations
 
 (async () => {
 	await npx('prisma generate');
 	await npx('prisma migrate deploy');
 })();
-