diff --git a/nixos/tests/tlsrpt.nix b/nixos/tests/tlsrpt.nix
index 92a7d0cda78e..0c2ea2b67a44 100644
--- a/nixos/tests/tlsrpt.nix
+++ b/nixos/tests/tlsrpt.nix
@@ -34,7 +34,7 @@
     machine.wait_until_succeeds("journalctl -o cat -u tlsrpt-reportd | grep -Pq 'Fetcher .* finished'")
 
     # Enabling postfix should put sendmail as the sendmail setting
-    machine.succeed("grep -q sendmail_script=sendmail /etc/tlsrpt/reportd.cfg")
+    machine.succeed("grep -q sendmail_script=/run/wrappers/bin/sendmail /etc/tlsrpt/reportd.cfg")
     machine.succeed("getent group tlsrpt | grep -q postfix")
 
     machine.log(machine.succeed("systemd-analyze security tlsrpt-collectd.service tlsrpt-reportd.service | grep -v ✓"))