diff --git a/ChangeLog b/ChangeLog
index 36100915d4..e14d9f326a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Apr 30 04:09:30 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* time.c (TIMET_MAX): should be time_t, not unsigned_time_t.
+
 Fri Apr 30 03:59:08 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* time.c (rb_time_unmagnify_to_float): should cast.
diff --git a/time.c b/time.c
index 8e055b837d..f6d0f3a7cb 100644
--- a/time.c
+++ b/time.c
@@ -711,7 +711,7 @@ typedef unsigned LONG_LONG unsigned_time_t;
 # error cannot find integer type which size is same as time_t.
 #endif
 
-#define TIMET_MAX (~(time_t)0 <= 0 ? (time_t)((~(unsigned_time_t)0) >> 1) : (~(unsigned_time_t)0))
+#define TIMET_MAX (~(time_t)0 <= 0 ? (time_t)((~(unsigned_time_t)0) >> 1) : (time_t)(~(unsigned_time_t)0))
 #define TIMET_MIN (~(time_t)0 <= 0 ? (time_t)(((unsigned_time_t)1) << (sizeof(time_t) * CHAR_BIT - 1)) : (time_t)0)
 
 static wideval_t