diff --git a/core/AmSession.cpp b/core/AmSession.cpp
index 57339ff4..e25caafe 100644
--- a/core/AmSession.cpp
+++ b/core/AmSession.cpp
@@ -425,7 +425,7 @@ string AmSession::getNewId()
 
   id += int2hex(get_random()) + "-";
   id += int2hex(t.tv_sec) + int2hex(t.tv_usec) + "-";
-  id += int2hex((unsigned int) pthread_self());
+  id += int2hex((unsigned int)((unsigned long)pthread_self()));
 
   return id;
 }
diff --git a/core/AmThread.cpp b/core/AmThread.cpp
index ccb1eb61..98cac9d4 100644
--- a/core/AmThread.cpp
+++ b/core/AmThread.cpp
@@ -64,12 +64,12 @@ AmThread::AmThread()
 void * AmThread::_start(void * _t)
 {
   AmThread* _this = (AmThread*)_t;
-  _this->_pid = (pid_t) _this->_td;
-  DBG("Thread %lu is starting.\n", (unsigned long int) _this->_pid);
+  _this->_pid = (unsigned long) _this->_td;
+  DBG("Thread %lu is starting.\n", (unsigned long) _this->_pid);
   _this->_stopped.set(false);
   _this->run();
 
-  DBG("Thread %lu is ending.\n", (unsigned long int) _this->_pid);
+  DBG("Thread %lu is ending.\n", (unsigned long) _this->_pid);
   _this->_stopped.set(true);
     
   //thread_nr_mut.lock();
diff --git a/core/AmThread.h b/core/AmThread.h
index 18045334..410ce718 100644
--- a/core/AmThread.h
+++ b/core/AmThread.h
@@ -170,7 +170,7 @@ protected:
   virtual void on_stop()=0;
 
 public:
-  pid_t     _pid;
+  unsigned long _pid;
   AmThread();
   virtual ~AmThread() {}