diff --git a/ChangeLog b/ChangeLog
index 541f7bb2cb..847b4dda4c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Oct  4 10:22:21 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* random.c (rand_init): This checks the value is in 32bit or not,
+	  so use int32_t, not int.
+
 Mon Oct  4 09:47:39 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* random.c (rand_init): remove useless assignment.
diff --git a/random.c b/random.c
index c630e9b6b5..dbc77d0532 100644
--- a/random.c
+++ b/random.c
@@ -403,7 +403,7 @@ rand_init(struct MT *mt, VALUE vseed)
             fixnum_seed = -fixnum_seed;
 	buf[0] = (unsigned int)(fixnum_seed & 0xffffffff);
 #if SIZEOF_LONG > SIZEOF_INT32
-	if ((long)(int)fixnum_seed != fixnum_seed) {
+	if ((long)(int32_t)fixnum_seed != fixnum_seed) {
 	    if ((buf[1] = (unsigned int)(fixnum_seed >> 32)) != 0) ++len;
 	}
 #endif