1 files changed, 4 insertions, 0 deletions
diff --git a/yarvcore.h b/yarvcore.h
index 1c7007ad42..ae439a5a60 100644
--- a/yarvcore.h
+++ b/yarvcore.h
@@ -486,6 +486,10 @@ struct rb_thread_struct
     /* for GC */
     VALUE *machine_stack_start;
     VALUE *machine_stack_end;
+#ifdef __ia64
+    VALUE *machine_register_stack_start;
+    VALUE *machine_register_stack_end;
+#endif
     jmp_buf machine_regs;
     int mark_stack_len;