diff --git a/src/Common/ThreadStatus.h b/src/Common/ThreadStatus.h
index b414a9bccf5..67450d8c779 100644
--- a/src/Common/ThreadStatus.h
+++ b/src/Common/ThreadStatus.h
@@ -78,7 +78,7 @@ public:
     InternalProfileEventsQueueWeakPtr profile_queue_ptr;
     std::function<void()> fatal_error_callback;
 
-    std::vector<UInt64> thread_ids;
+    std::unordered_set<UInt64> thread_ids;
     std::unordered_set<ThreadStatusPtr> threads;
 
     /// The first thread created this thread group
diff --git a/src/Interpreters/ThreadStatusExt.cpp b/src/Interpreters/ThreadStatusExt.cpp
index 3e7f08e9d9a..4810174e395 100644
--- a/src/Interpreters/ThreadStatusExt.cpp
+++ b/src/Interpreters/ThreadStatusExt.cpp
@@ -109,7 +109,7 @@ void ThreadStatus::setupState(const ThreadGroupStatusPtr & thread_group_)
         std::lock_guard lock(thread_group->mutex);
 
         /// NOTE: thread may be attached multiple times if it is reused from a thread pool.
-        thread_group->thread_ids.emplace_back(thread_id);
+        thread_group->thread_ids.insert(thread_id);
         thread_group->threads.insert(this);
 
         logs_queue_ptr = thread_group->logs_queue_ptr;