diff --git a/packages/sw/src/sw.ts b/packages/sw/src/sw.ts
index 1683fe06fa..16c4e06dfc 100644
--- a/packages/sw/src/sw.ts
+++ b/packages/sw/src/sw.ts
@@ -27,7 +27,7 @@ globalThis.addEventListener('activate', ev => {
 });
 
 function offlineContentHTML(): string {
-	return `<!doctype html>Offline. Service Worker @${_VERSION_} | @${_BASEDMISSKEYVERSION_} <button onclick="location.reload()">reload</button>`;
+	return `<!doctype html>Offline. Service Worker @${_VERSION_}_${_BASEDMISSKEYVERSION_} <button onclick="location.reload()">reload</button>`;
 }
 
 globalThis.addEventListener('fetch', ev => {
