diff --git a/ChangeLog b/ChangeLog
index 2bd73ef4fd..898b54945e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep  4 20:40:57 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (round): added declaration.  [ruby-dev:39222]
+
 Fri Sep  4 06:15:39 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* dir.c (Init_Dir): alias Dir#path to Dir#to_path.  [ruby-core:25326]
diff --git a/numeric.c b/numeric.c
index 7f74cde562..09a6ef329d 100644
--- a/numeric.c
+++ b/numeric.c
@@ -63,6 +63,8 @@
 #define DBL_EPSILON 2.2204460492503131e-16
 #endif
 
+extern double round(double);
+
 #ifndef HAVE_ROUND
 double
 round(double x)
@@ -79,9 +81,6 @@ round(double x)
     }
     return x;
 }
-#elif defined(__BEOS__)
-/* appears to be a bug in the BeOS headers */
-double round(double x);
 #endif
 
 static ID id_coerce, id_to_i, id_eq;