diff --git a/libs/utils/Threads.cpp b/libs/utils/Threads.cpp
index ad9a94f..b1bd828 100644
--- a/libs/utils/Threads.cpp
+++ b/libs/utils/Threads.cpp
@@ -778,6 +778,7 @@
             // called by a new thread using the same thread ID as this one.
             self->mThread = thread_id_t(-1);
             self->mThreadExitedCondition.broadcast();
+            self->mThread = thread_id_t(-1); // thread id could be reused
             self->mLock.unlock();
             break;
         }