diff --git a/nix/nixos-module/collectd/dhcpcount.rb b/nix/nixos-module/collectd/dhcpcount.rb
index 22062e8..1c0f7b5 100644
--- a/nix/nixos-module/collectd/dhcpcount.rb
+++ b/nix/nixos-module/collectd/dhcpcount.rb
@@ -4,7 +4,7 @@ require 'date'
 
 INTERVAL = 10
 TIMEOUT = ARGV[0].to_i
-hostname = `hostname`.strip
+hostname = IO::readlines("/proc/sys/kernel/hostname").join.strip
 STDOUT.sync = true
 
 loop do