diff --git a/bin/run-mastodon.js b/bin/run-mastodon.js
index 5daada9..ff8c8a9 100644
--- a/bin/run-mastodon.js
+++ b/bin/run-mastodon.js
@@ -42,7 +42,7 @@ async function cloneMastodon () {
     await stat(mastodonDir)
   } catch (e) {
     console.log('Cloning mastodon...')
-    await exec(`git clone ${GIT_URL} "${mastodonDir}"`)
+    await exec(`git clone --single-branch --branch master ${GIT_URL} "${mastodonDir}"`)
     await exec(`git checkout ${GIT_TAG}`, { cwd: mastodonDir })
     await writeFile(path.join(dir, '../mastodon/.env'), envFile, 'utf8')
   }