diff --git a/winsup/cygwin/localtime.cc b/winsup/cygwin/localtime.cc
index 794c03e2d..88290c663 100644
--- a/winsup/cygwin/localtime.cc
+++ b/winsup/cygwin/localtime.cc
@@ -1,4 +1,4 @@
-/*	$NetBSD: localtime.c,v 1.78 2013/09/20 19:06:54 christos Exp $	*/
+/*	$NetBSD: localtime.c,v 1.79 2013/12/13 10:34:47 christos Exp $	*/
 
 /*
 ** This file is in the public domain, so clarified as of
@@ -90,7 +90,7 @@ static char	privatehid[] = "@(#)private.h	7.48";
 #if 0
 static char	elsieid[] = "@(#)localtime.cc	8.17";
 #else
-__RCSID("$NetBSD: localtime.c,v 1.78 2013/09/20 19:06:54 christos Exp $");
+__RCSID("$NetBSD: localtime.c,v 1.79 2013/12/13 10:34:47 christos Exp $");
 #endif
 
 /*
@@ -1425,7 +1425,7 @@ tzparse(timezone_t sp, const char *name, const int lastditch)
 				}
 				if (time_t_max - janfirst < yearsecs)
 					break;
-				janfirst += yearsecs;
+				janfirst += (time_t)yearsecs;
 			}
 			/*
 			** Get zone offsets into tzinfo (for newlib). . .