diff --git a/packages/vite/src/node/optimizer/index.ts b/packages/vite/src/node/optimizer/index.ts
index 2f696d25bd57f2..a1ea5f06e65812 100644
--- a/packages/vite/src/node/optimizer/index.ts
+++ b/packages/vite/src/node/optimizer/index.ts
@@ -1259,7 +1259,7 @@ function getLockfileHash(environment: Environment): string {
     if (lockfileFormat.checkPatchesDir) {
       // Default of https://github.com/ds300/patch-package
       const baseDir = lockfilePath.slice(0, -lockfileFormat.path.length)
-      const fullPath = path.join(baseDir, lockfileFormat.checkPatchesDir)
+      const fullPath = path.join(baseDir, lockfileFormat.checkPatchesDir as string)
       const stat = tryStatSync(fullPath)
       if (stat?.isDirectory()) {
         content += stat.mtimeMs.toString()