diff --git a/nixos/modules/services/mail/nullmailer.nix b/nixos/modules/services/mail/nullmailer.nix
index b2c738ab6eb..2eb2d39fc62 100644
--- a/nixos/modules/services/mail/nullmailer.nix
+++ b/nixos/modules/services/mail/nullmailer.nix
@@ -192,7 +192,7 @@ with lib;
 
       preStart = ''
         mkdir -p /var/spool/nullmailer/{queue,tmp}
-        rm -f var/spool/nullmailer/trigger && mkfifo -m 660 /var/spool/nullmailer/trigger
+        rm -f /var/spool/nullmailer/trigger && mkfifo -m 660 /var/spool/nullmailer/trigger
         chown ${cfg.user} /var/spool/nullmailer/*
       '';