diff --git a/ChangeLog b/ChangeLog
index ed1be3bff6..7082638854 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Feb 24 13:13:49 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* missing/vsnprintf.c (BSD_vfprintf): ptrdiff_t may be larger than
+	  long.
+
 Tue Feb 24 11:21:50 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* signal.c (rb_disable_interrupt, rb_enable_interrupt): see
diff --git a/missing/vsnprintf.c b/missing/vsnprintf.c
index a19ed5c6cc..9d0e626946 100644
--- a/missing/vsnprintf.c
+++ b/missing/vsnprintf.c
@@ -713,11 +713,16 @@ reswitch:	switch (ch) {
 		case 'h':
 			flags |= SHORTINT;
 			goto rflag;
+#if SIZEOF_PTRDIFF_T == SIZEOF_LONG
 		case 't':
+#endif
 		case 'l':
 			flags |= LONGINT;
 			goto rflag;
 #ifdef _HAVE_SANE_QUAD_
+#if SIZEOF_PTRDIFF_T == SIZEOF_LONG_LONG
+		case 't':
+#endif
 		case 'q':
 			flags |= QUADINT;
 			goto rflag;