diff --git a/ChangeLog b/ChangeLog
index 6a4951967a..2d7f35b981 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Thu Mar 12 05:09:56 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Mar 12 05:12:53 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* thread_pthread.c (ruby_init_stack): range of rlim_cur may be
+	  larger than int.
 
 	* missing/vsnprintf.c (BSD_vfprintf): commented out code which has
 	  no effect at all.
diff --git a/thread_pthread.c b/thread_pthread.c
index 91c5b42d67..11a70d77a3 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -292,10 +292,10 @@ ruby_init_stack(VALUE *addr
 	struct rlimit rlim;
 
 	if (getrlimit(RLIMIT_STACK, &rlim) == 0) {
-	    unsigned int space = rlim.rlim_cur/5;
+	    size_t space = (size_t)(rlim.rlim_cur/5);
 
 	    if (space > 1024*1024) space = 1024*1024;
-	    native_main_thread.stack_maxsize = rlim.rlim_cur - space;
+	    native_main_thread.stack_maxsize = (size_t)rlim.rlim_cur - space;
 	}
     }
 #endif