diff --git a/ChangeLog b/ChangeLog
index 2a5997177d..142d896102 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Nov  4 16:06:11 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby/st.h (SIZEOF_ST_INDEX_T): moved from st.c for
+	  Init_RandomSeed().
+
 Wed Nov  4 15:50:16 2009  URABE Shyouhei  <shyouhei@ruby-lang.org>
 
 	* include/ruby/ruby.h (NUM2CHR): prefix __extension__ for
diff --git a/include/ruby/st.h b/include/ruby/st.h
index fd9bc4e1ec..d60ccd9a9a 100644
--- a/include/ruby/st.h
+++ b/include/ruby/st.h
@@ -66,6 +66,9 @@ typedef st_data_t st_index_t;
 typedef int st_compare_func(st_data_t, st_data_t);
 typedef st_index_t st_hash_func(st_data_t);
 
+typedef char st_check_for_sizeof_st_index_t[SIZEOF_VOIDP == (int)sizeof(st_index_t) ? 1 : -1];
+#define SIZEOF_ST_INDEX_T SIZEOF_VOIDP
+
 struct st_hash_type {
     int (*compare)(ANYARGS /*st_data_t, st_data_t*/); /* st_compare_func* */
     st_index_t (*hash)(ANYARGS /*st_data_t*/);        /* st_hash_func* */
diff --git a/st.c b/st.c
index f99c1eef14..7a5509cbc9 100644
--- a/st.c
+++ b/st.c
@@ -1003,9 +1003,6 @@ strhash(st_data_t arg)
 #define MURMUR 2
 #endif
 
-typedef char check_murmur_voidp[SIZEOF_VOIDP == (int)sizeof(st_index_t) ? 1 : -1];
-#define SIZEOF_ST_INDEX_T SIZEOF_VOIDP
-
 #if MURMUR == 1
 #define MurmurMagic 0xc6a4a793
 #elif MURMUR == 2