diff --git a/Libraries/LibThread/Thread.h b/Libraries/LibThread/Thread.h
index 6f2fc8d4c1..56a8bc5eb0 100644
--- a/Libraries/LibThread/Thread.h
+++ b/Libraries/LibThread/Thread.h
@@ -45,7 +45,7 @@ public:
 
 private:
     Function<int()> m_action;
-    pthread_t m_tid;
+    pthread_t m_tid { 0 };
     String m_thread_name;
 };