1 files changed, 1 insertions, 0 deletions
diff --git a/gc.h b/gc.h
index b9b1eb4ece..0c3d351416 100644
--- a/gc.h
+++ b/gc.h
@@ -3,6 +3,7 @@
 #define RUBY_GC_H 1
 
 NOINLINE(void rb_gc_set_stack_end(VALUE **stack_end_p));
+NOINLINE(void rb_gc_save_machine_context(rb_thread_t *));
 
 /* for GC debug */