1 files changed, 1 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index cc39169073..33a81ebe6e 100644
--- a/intern.h
+++ b/intern.h
@@ -336,6 +336,7 @@ 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));