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-rw-r--r--intrpvar.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/intrpvar.h b/intrpvar.h
index f3014cbb14..be081be3d5 100644
--- a/intrpvar.h
+++ b/intrpvar.h
@@ -156,4 +156,5 @@ PERLVAR(Iofmt, char *) /* $# */
#ifdef USE_THREADS
PERLVAR(Ithrsv, SV *) /* holds struct perl_thread for main thread */
+PERLVARI(Ithreadnum, U32, 0) /* incremented each thread creation */
#endif /* USE_THREADS */