diff --git a/rtl/qnx/dos.inc b/rtl/qnx/dos.inc
index 973927befb..d6761476e9 100644
--- a/rtl/qnx/dos.inc
+++ b/rtl/qnx/dos.inc
@@ -117,9 +117,9 @@ End;
 
 { QNX stores its timezone information, in POSIX format }
 { in the /etc/TIMEZONE file.                           }
-function GetTimezoneString: string;
+function GetTimezoneString: shortstring;
 var
- s: string;
+ s: shortstring;
  T: text;
 begin
  GetTimeZoneString:='';