diff --git a/src/core/thread.d b/src/core/thread.d
index 388c139..5b4493f 100644
--- a/src/core/thread.d
+++ b/src/core/thread.d
@@ -980,6 +980,20 @@ class Thread
         }
     }
 
+    /**
+     * Opaque type for the system-level thread identifier
+     */
+    version( Windows ) alias uint ThreadAddr;
+    else version( Posix ) alias pthread_t ThreadAddr;
+
+    /**
+     * System-level thread identifier
+     */
+    final @property ThreadAddr threadId()
+    {
+       return m_addr;
+    }
+
 
     ///////////////////////////////////////////////////////////////////////////
     // Thread Priority Actions
@@ -1393,12 +1407,10 @@ private:
     version( Windows )
     {
         alias uint TLSKey;
-        alias uint ThreadAddr;
     }
     else version( Posix )
     {
         alias pthread_key_t TLSKey;
-        alias pthread_t     ThreadAddr;
     }