diff --git a/winixd/core/timezone.cpp b/winixd/core/timezone.cpp
index fd385d1..b50d1c6 100644
--- a/winixd/core/timezone.cpp
+++ b/winixd/core/timezone.cpp
@@ -259,7 +259,7 @@ bool TimeZone::SetTzDst(PT::Space & year)
 
 	int year_int = Toi(year.name);
 
-	if( year_int < 1970 && year_int > 10000 )
+	if( year_int < 1970 || year_int > 10000 )
 		return false;
 
 	dst.has_dst = year.Bool(L"has_dst", false);