1 files changed, 1 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index 3c00a2bd2b..5b2ce7d73e 100644
--- a/intern.h
+++ b/intern.h
@@ -401,6 +401,7 @@ int rb_is_local_id(ID);
 int rb_is_junk_id(ID);
 int rb_symname_p(const char*);
 int rb_sym_interned_p(VALUE);
+void rb_gc_mark_symbols(void);
 VALUE rb_backref_get(void);
 void rb_backref_set(VALUE);
 VALUE rb_lastline_get(void);