diff --git a/src/libCom/osi/os/vxWorks/osdThread.c b/src/libCom/osi/os/vxWorks/osdThread.c
index 9377df281..5aac9ad1c 100644
--- a/src/libCom/osi/os/vxWorks/osdThread.c
+++ b/src/libCom/osi/os/vxWorks/osdThread.c
@@ -107,6 +107,7 @@ static void createFunction(THREADFUNC func, void *parm)
     int tid = taskIdSelf();
 
     taskVarAdd(tid,(int *)&papTSD);
+    papTSD = 0;
     (*func)(parm);
     taskVarDelete(tid,(int *)&papTSD);
     free(papTSD);