diff --git a/shell-completion/bash/systemd-run b/shell-completion/bash/systemd-run
index 4940744f31..dee47d9dbe 100644
--- a/shell-completion/bash/systemd-run
+++ b/shell-completion/bash/systemd-run
@@ -85,7 +85,8 @@ _systemd_run() {
                          PrivateNetwork= NoNewPrivileges= WorkingDirectory= RootDirectory=
                          TTYPath= SyslogIdentifier= SyslogLevelPrefix= SyslogLevel=
                          SyslogFacility= TimerSlackNSec= OOMScoreAdjust= ReadWriteDirectories=
-                         ReadOnlyDirectories= InaccessibleDirectories= EnvironmentFile='
+                         ReadOnlyDirectories= InaccessibleDirectories= EnvironmentFile=
+                         ProtectSystem='
 
             COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
             return 0
diff --git a/shell-completion/zsh/_systemd-run b/shell-completion/zsh/_systemd-run
index cd9d47b42b..3254d05135 100644
--- a/shell-completion/zsh/_systemd-run
+++ b/shell-completion/zsh/_systemd-run
@@ -39,6 +39,7 @@ _arguments \
                 TTYPath= SyslogIdentifier= SyslogLevelPrefix= SyslogLevel= \
                 SyslogFacility= TimerSlackNSec= OOMScoreAdjust= ReadWriteDirectories= \
                 ReadOnlyDirectories= InaccessibleDirectories= EnvironmentFile= \
+                ProtectSystem= \
                 ))' \
         '--description=[Description for unit]:description' \
         '--slice=[Run in the specified slice]:slices:__slices' \