diff --git a/ThreadPool.h b/ThreadPool.h
index 4183203..be1d214 100644
--- a/ThreadPool.h
+++ b/ThreadPool.h
@@ -84,7 +84,7 @@ auto ThreadPool::enqueue(F&& f, Args&&... args)
 }
 
 // the destructor joins all threads
-inline ThreadPool::~ThreadPool()
+ThreadPool::~ThreadPool()
 {
     {
         std::unique_lock<std::mutex> lock(queue_mutex);