diff --git a/src/cache.ts b/src/cache.ts
index a007489e..36079353 100644
--- a/src/cache.ts
+++ b/src/cache.ts
@@ -27,7 +27,7 @@ export function ensureInstance() {
 export function getServerInstance() {
   const instance = getCurrentInstance()
 
-  if (instance?.proxy.$isServer)
+  if (process.env.VITE_SSG || instance?.proxy.$isServer)
     return instance.proxy as InstanceType<VueConstructor>
   return false
 }