diff --git a/ChangeLog b/ChangeLog
index 90f7516fa5..94b833d3c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Sep 21 19:04:08 2014  Narihiro Nakamura <authornari@gmail.com>
+
+	* st.c (do_hash_bin): unused macro.
+
 Sun Sep 21 18:45:01 2014  Narihiro Nakamura <authornari@gmail.com>
 
 	* parse.y (parser_class_nest): unused variable after YARV
diff --git a/st.c b/st.c
index 15ae6949eb..fa3fa3f037 100644
--- a/st.c
+++ b/st.c
@@ -87,7 +87,6 @@ static void rehash(st_table *);
 
 #define do_hash(key,table) (st_index_t)(*(table)->type->hash)((key))
 #define hash_pos(h,n) ((h) & (n - 1))
-#define do_hash_bin(key,table) hash_pos(do_hash((key), (table)), (table)->num_bins)
 
 /* preparation for possible allocation improvements */
 #define st_alloc_entry() (st_table_entry *)malloc(sizeof(st_table_entry))