1 files changed, 1 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index e2fea30882..3c00a2bd2b 100644
--- a/intern.h
+++ b/intern.h
@@ -400,6 +400,7 @@ int rb_is_class_id(ID);
 int rb_is_local_id(ID);
 int rb_is_junk_id(ID);
 int rb_symname_p(const char*);
+int rb_sym_interned_p(VALUE);
 VALUE rb_backref_get(void);
 void rb_backref_set(VALUE);
 VALUE rb_lastline_get(void);