1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index eb835f30d6..f106f4cfa5 100644
--- a/internal.h
+++ b/internal.h
@@ -671,6 +671,7 @@ void rb_gc_resurrect(VALUE ptr);
 /* hash.c */
 struct st_table *rb_hash_tbl_raw(VALUE hash);
 VALUE rb_hash_has_key(VALUE hash, VALUE key);
+VALUE rb_hash_set_default_proc(VALUE hash, VALUE proc);
 
 #define RHASH_TBL_RAW(h) rb_hash_tbl_raw(h)
 VALUE rb_hash_keys(VALUE hash);