diff --git a/nixos/modules/hardware/ckb-next.nix b/nixos/modules/hardware/ckb-next.nix
index fe0ca9f26d5..6932be1c54c 100644
--- a/nixos/modules/hardware/ckb-next.nix
+++ b/nixos/modules/hardware/ckb-next.nix
@@ -43,7 +43,6 @@ in
         serviceConfig = {
           ExecStart = "${cfg.package}/bin/ckb-next-daemon ${optionalString (cfg.gid != null) "--gid=${builtins.toString cfg.gid}"}";
           Restart = "on-failure";
-          StandardOutput = "syslog";
         };
       };
     };
diff --git a/nixos/modules/security/tpm2.nix b/nixos/modules/security/tpm2.nix
index 13804fb82cb..27f9b58c975 100644
--- a/nixos/modules/security/tpm2.nix
+++ b/nixos/modules/security/tpm2.nix
@@ -170,7 +170,6 @@ in {
           Restart = "always";
           RestartSec = 30;
           BusName = "com.intel.tss2.Tabrmd";
-          StandardOutput = "syslog";
           ExecStart = "${cfg.abrmd.package}/bin/tpm2-abrmd";
           User = "tss";
           Group = "nogroup";
diff --git a/nixos/modules/services/security/privacyidea.nix b/nixos/modules/services/security/privacyidea.nix
index d6abfd0e271..c2988858e56 100644
--- a/nixos/modules/services/security/privacyidea.nix
+++ b/nixos/modules/services/security/privacyidea.nix
@@ -234,7 +234,6 @@ in
           ExecStop = "${pkgs.coreutils}/bin/kill -INT $MAINPID";
           NotifyAccess = "main";
           KillSignal = "SIGQUIT";
-          StandardError = "syslog";
         };
       };
 
diff --git a/nixos/modules/services/system/earlyoom.nix b/nixos/modules/services/system/earlyoom.nix
index c6a001d30ee..e29bdbe264c 100644
--- a/nixos/modules/services/system/earlyoom.nix
+++ b/nixos/modules/services/system/earlyoom.nix
@@ -106,7 +106,6 @@ in
       path = optional ecfg.enableNotifications pkgs.dbus;
       serviceConfig = {
         StandardOutput = "null";
-        StandardError = "syslog";
         ExecStart = ''
           ${pkgs.earlyoom}/bin/earlyoom \
           -m ${toString ecfg.freeMemThreshold} \
diff --git a/nixos/modules/services/wayland/cage.nix b/nixos/modules/services/wayland/cage.nix
index c59ca9983a6..50e424fccbf 100644
--- a/nixos/modules/services/wayland/cage.nix
+++ b/nixos/modules/services/wayland/cage.nix
@@ -73,8 +73,6 @@ in {
         TTYVTDisallocate = "yes";
         # Fail to start if not controlling the virtual terminal.
         StandardInput = "tty-fail";
-        StandardOutput = "syslog";
-        StandardError = "syslog";
         # Set up a full (custom) user session for the user, required by Cage.
         PAMName = "cage";
       };
diff --git a/nixos/modules/services/web-apps/tt-rss.nix b/nixos/modules/services/web-apps/tt-rss.nix
index 2ea9537b93d..6a29f10d119 100644
--- a/nixos/modules/services/web-apps/tt-rss.nix
+++ b/nixos/modules/services/web-apps/tt-rss.nix
@@ -632,8 +632,6 @@ let
           User = "${cfg.user}";
           Group = "tt_rss";
           ExecStart = "${pkgs.php}/bin/php ${cfg.root}/update.php --daemon --quiet";
-          StandardOutput = "syslog";
-          StandardError = "syslog";
           Restart = "on-failure";
           RestartSec = "60";
           SyslogIdentifier = "tt-rss";
diff --git a/nixos/modules/services/x11/display-managers/gdm.nix b/nixos/modules/services/x11/display-managers/gdm.nix
index 573049ab07a..23ab7f2ae43 100644
--- a/nixos/modules/services/x11/display-managers/gdm.nix
+++ b/nixos/modules/services/x11/display-managers/gdm.nix
@@ -200,7 +200,6 @@ in
       KillMode = "mixed";
       IgnoreSIGPIPE = "no";
       BusName = "org.gnome.DisplayManager";
-      StandardOutput = "syslog";
       StandardError = "inherit";
       ExecReload = "${pkgs.coreutils}/bin/kill -SIGHUP $MAINPID";
       KeyringMode = "shared";
diff --git a/nixos/modules/services/x11/display-managers/lightdm.nix b/nixos/modules/services/x11/display-managers/lightdm.nix
index 3bee21fa822..143785db0b4 100644
--- a/nixos/modules/services/x11/display-managers/lightdm.nix
+++ b/nixos/modules/services/x11/display-managers/lightdm.nix
@@ -253,7 +253,6 @@ in
       KeyringMode = "shared";
       KillMode = "mixed";
       StandardError = "inherit";
-      StandardOutput = "syslog";
     };
 
     environment.etc."lightdm/lightdm.conf".source = lightdmConf;
diff --git a/nixos/tests/virtualbox.nix b/nixos/tests/virtualbox.nix
index aec8da6a2af..af76e6f9844 100644
--- a/nixos/tests/virtualbox.nix
+++ b/nixos/tests/virtualbox.nix
@@ -198,7 +198,6 @@ let
       systemd.services."vboxtestlog-${name}@" = {
         description = "VirtualBox Test Machine Log For ${name}";
         serviceConfig.StandardInput = "socket";
-        serviceConfig.StandardOutput = "syslog";
         serviceConfig.SyslogIdentifier = "GUEST-${name}";
         serviceConfig.ExecStart = "${pkgs.coreutils}/bin/cat";
       };