diff --git a/ChangeLog b/ChangeLog
index 5dc45a0c25..ca943af568 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Mon Jul  8 23:12:22 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Mon Jul  8 23:12:48 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (finite): add declaration for strict ANSI.
+	  [ruby-core:55312] [Bug #8495]
 
 	* thread_win32.c (w32_thread_start_func, thread_start_func_1),
 	  (timer_thread_func): use __stdcall instead of _stdcall which is
diff --git a/numeric.c b/numeric.c
index 6752becc00..1e9a3bc6d7 100644
--- a/numeric.c
+++ b/numeric.c
@@ -30,6 +30,10 @@
 #include <ieeefp.h>
 #endif
 
+#if defined HAVE_FINITE && !defined finite
+extern int finite(double);
+#endif
+
 /* use IEEE 64bit values if not defined */
 #ifndef FLT_RADIX
 #define FLT_RADIX 2