diff --git a/nixos/modules/testing/test-instrumentation.nix b/nixos/modules/testing/test-instrumentation.nix
index 67fdc0ea4335..6dc4091bad17 100644
--- a/nixos/modules/testing/test-instrumentation.nix
+++ b/nixos/modules/testing/test-instrumentation.nix
@@ -115,10 +115,12 @@ in
       ShowStatus=no
       # Allow very slow start
       DefaultTimeoutStartSec=300
+      DefaultDeviceTimeoutSec=300
     '';
     systemd.user.extraConfig = ''
       # Allow very slow start
       DefaultTimeoutStartSec=300
+      DefaultDeviceTimeoutSec=300
     '';
 
     boot.initrd.systemd.extraConfig = config.systemd.extraConfig;