diff --git a/src/index.ts b/src/index.ts
index a2f012d..d653141 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,9 +7,9 @@ import type { RootHookObject } from 'mocha'
 
 const session = new inspector.Session()
 const procname = process.argv0
-const pkgname = readpkg.sync()?.packageJson.name || null
+const pkgname = readpkg.sync()?.packageJson.name
 const pid = process.pid
-const filename = `${pkgname ?? procname}.${pid}.cpuprofile`
+const filename = `${pkgname?.length ? pkgname : procname}.${pid}.cpuprofile`
 const destination = path.resolve(process.cwd(), filename)
 
 const mochaHooks: RootHookObject = {