diff --git a/nixos/modules/system/boot/systemd/nspawn.nix b/nixos/modules/system/boot/systemd/nspawn.nix
index cbc89554c9fd..b513aa051f28 100644
--- a/nixos/modules/system/boot/systemd/nspawn.nix
+++ b/nixos/modules/system/boot/systemd/nspawn.nix
@@ -11,7 +11,7 @@ let
     (assertOnlyFields [
       "Boot" "ProcessTwo" "Parameters" "Environment" "User" "WorkingDirectory"
       "PivotRoot" "Capability" "DropCapability" "NoNewPrivileges" "KillSignal"
-      "Personality" "MachineId" "PrivateUsers" "NotifyReady" "SystemCallFilter"
+      "Personality" "MachineID" "PrivateUsers" "NotifyReady" "SystemCallFilter"
       "LimitCPU" "LimitFSIZE" "LimitDATA" "LimitSTACK" "LimitCORE" "LimitRSS"
       "LimitNOFILE" "LimitAS" "LimitNPROC" "LimitMEMLOCK" "LimitLOCKS"
       "LimitSIGPENDING" "LimitMSGQUEUE" "LimitNICE" "LimitRTPRIO" "LimitRTTIME"