diff --git a/shell-completion/bash/loginctl b/shell-completion/bash/loginctl
index 7a083d28756..776eca4e626 100644
--- a/shell-completion/bash/loginctl
+++ b/shell-completion/bash/loginctl
@@ -41,7 +41,8 @@ _loginctl () {
         if __contains_word "$prev" ${OPTS[ARG]}; then
                 case $prev in
                         --signal|-s)
-                                comps=$(compgen -A signal)
+                                _signals
+                                return
                         ;;
                         --kill-who)
                                 comps='all leader'
diff --git a/shell-completion/bash/machinectl b/shell-completion/bash/machinectl
index 140465d3168..61c54027860 100644
--- a/shell-completion/bash/machinectl
+++ b/shell-completion/bash/machinectl
@@ -57,7 +57,8 @@ _machinectl() {
         if __contains_word "$prev" ${OPTS[ARG]}; then
                 case $prev in
                         --signal|-s)
-                                comps=$(compgen -A signal)
+                                _signals
+                                return
                         ;;
                         --kill-who)
                                 comps='all leader'
diff --git a/shell-completion/bash/systemctl.in b/shell-completion/bash/systemctl.in
index d80d8f02a81..6ffab33e459 100644
--- a/shell-completion/bash/systemctl.in
+++ b/shell-completion/bash/systemctl.in
@@ -115,7 +115,8 @@ _systemctl () {
         if __contains_word "$prev" ${OPTS[ARG]}; then
                 case $prev in
                         --signal|-s)
-                                comps=$(compgen -A signal)
+                                _signals
+                                return
                         ;;
                         --type|-t)
                                 comps=$(__systemctl $mode -t help)