diff --git a/nix/nixos-module/collectd/dhcpcount.rb b/nix/nixos-module/collectd/dhcpcount.rb
index 1c0f7b5..73cb81d 100644
--- a/nix/nixos-module/collectd/dhcpcount.rb
+++ b/nix/nixos-module/collectd/dhcpcount.rb
@@ -14,7 +14,7 @@ loop do
   addr = nil
   starts = nil
 
-  IO::readlines("/var/lib/dhcp/dhcpd.leases").each do |line|
+  IO::readlines("/var/lib/dhcpd4/dhcpd.leases").each do |line|
     if line =~ /^lease (.+) \{/
       addr = $1