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-rw-r--r--nptl/pthread_join.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/nptl/pthread_join.c b/nptl/pthread_join.c
index 387f230576..84f993c700 100644
--- a/nptl/pthread_join.c
+++ b/nptl/pthread_join.c
@@ -40,7 +40,7 @@ pthread_join (threadid, thread_return)
   struct pthread *pd = (struct pthread *) threadid;
 
   /* Make sure the descriptor is valid.  */
-  if (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
+  if ((DEBUGGING_P && __find_in_stack_list (pd) == NULL) || pd->tid <= 0)
     /* Not a valid thread handle.  */
     return ESRCH;