1 files changed, 1 insertions, 1 deletions
diff --git a/rubysig.h b/rubysig.h
index fd43e85d28..232921ebc7 100644
--- a/rubysig.h
+++ b/rubysig.h
@@ -79,7 +79,7 @@ void rb_trap_restore_mask _((void));
 
 RUBY_EXTERN int rb_thread_critical;
 void rb_thread_schedule _((void));
-#if defined(HAVE_SETITIMER)
+#if defined(HAVE_SETITIMER) || defined(_THREAD_SAFE)
 RUBY_EXTERN int rb_thread_pending;
 # define CHECK_INTS do {\
     if (!rb_prohibit_interrupt) {\