diff --git a/ntp.spec b/ntp.spec
index 46cdd48..e6c59ce 100644
--- a/ntp.spec
+++ b/ntp.spec
@@ -124,8 +124,7 @@ This package contains NTP documentation in HTML format.
 
 # pool.ntp.org vendor zone which will be used in ntp.conf
 %if 0%{!?vendorzone:1}
-%{?fedora: %global vendorzone fedora.}
-%{?rhel: %global vendorzone rhel.}
+%global vendorzone %(source /etc/os-release && echo ${ID}.)
 %endif
 
 %prep