diff --git a/lib/cpp/src/concurrency/PosixThreadFactory.cpp b/lib/cpp/src/concurrency/PosixThreadFactory.cpp
index 73aba61..f6ab6c7 100644
--- a/lib/cpp/src/concurrency/PosixThreadFactory.cpp
+++ b/lib/cpp/src/concurrency/PosixThreadFactory.cpp
@@ -135,7 +135,7 @@
   }
 
   id_t getId() {
-    return static_cast<id_t>(pthread_);
+    return reinterpret_cast<id_t>(pthread_);
   }
 
   shared_ptr<Runnable> runnable() const { return Thread::runnable(); }
@@ -258,7 +258,7 @@
 
   void setDetached(bool value) { detached_ = value; }
 
-  Thread::id_t getCurrentThreadId() const {return static_cast<id_t>(pthread_self());}
+  Thread::id_t getCurrentThreadId() const {return reinterpret_cast<id_t>(pthread_self());}
 
 };