diff --git a/create_opendkim_key.sh b/create_opendkim_key.sh
index 630c4fd..9270986 100755
--- a/create_opendkim_key.sh
+++ b/create_opendkim_key.sh
@@ -341,7 +341,7 @@ systemd_supported=false
 systemd=$(which systemd)
 systemctl=$(which systemctl)
 
-if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
+if [[ -n "$systemd" ]] || [[ -n "$systemctl" ]] ; then
    systemd_supported=true
 fi
 
diff --git a/delete_opendkim_configuration.sh b/delete_opendkim_configuration.sh
index 9d8664a..097337f 100755
--- a/delete_opendkim_configuration.sh
+++ b/delete_opendkim_configuration.sh
@@ -271,7 +271,7 @@ systemd_supported=false
 systemd=$(which systemd)
 systemctl=$(which systemctl)
 
-if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
+if [[ -n "$systemd" ]] || [[ -n "$systemctl" ]] ; then
    systemd_supported=true
 fi