diff --git a/ChangeLog b/ChangeLog
index b70b7576f7..3643af52ed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Jul 28 12:41:39 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (absint_numwords_generic): The char_bit variable changed
+	  to static constant.
+
 Sun Jul 28 12:03:23 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c: Constify bary_* functions.
diff --git a/bignum.c b/bignum.c
index 7c54d82838..0c6170ab18 100644
--- a/bignum.c
+++ b/bignum.c
@@ -3175,8 +3175,8 @@ absint_numwords_small(size_t numbytes, int nlz_bits_in_msbyte, size_t word_numbi
 static size_t
 absint_numwords_generic(size_t numbytes, int nlz_bits_in_msbyte, size_t word_numbits, size_t *nlz_bits_ret)
 {
+    static const BDIGIT char_bit[1] = { CHAR_BIT };
     BDIGIT numbytes_bary[bdigit_roomof(sizeof(numbytes))];
-    BDIGIT char_bit[1] = { CHAR_BIT };
     BDIGIT val_numbits_bary[bdigit_roomof(sizeof(numbytes) + 1)];
     BDIGIT nlz_bits_in_msbyte_bary[1] = { nlz_bits_in_msbyte };
     BDIGIT word_numbits_bary[bdigit_roomof(sizeof(word_numbits))];