diff --git a/ChangeLog b/ChangeLog
index d81358b7ee..009220d971 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jul 15 11:24:48 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (maxpow_in_bdigit_dbl): Useless #if removed.
+
 Mon Jul 15 11:10:46 2013  Zachary Scott  <e@zzak.io>
 
 	* bignum.c (rb_big_coerce): [DOC] Add docs for Bignum#coerce
diff --git a/bignum.c b/bignum.c
index 5cbd80f5c5..be52af6b9b 100644
--- a/bignum.c
+++ b/bignum.c
@@ -402,8 +402,7 @@ maxpow_in_bdigit_dbl(int base, int *exp_ret)
     assert(2 <= base && base <= 36);
 
     {
-#if   SIZEOF_BDIGIT_DBL == 0
-#elif SIZEOF_BDIGIT_DBL == 2
+#if SIZEOF_BDIGIT_DBL == 2
         maxpow = maxpow16_num[base-2];
         exponent = maxpow16_exp[base-2];
 #elif SIZEOF_BDIGIT_DBL == 4