diff --git a/extras/vpnupgrade.sh b/extras/vpnupgrade.sh
index 9d041cf..57fb8f4 100644
--- a/extras/vpnupgrade.sh
+++ b/extras/vpnupgrade.sh
@@ -217,6 +217,7 @@ if [ "$SWAN_VER" = "3.31" ]; then
   sed -i '1033s/if (/if (LIN(POLICY_IKE_FRAG_ALLOW, sk->ike->sa.st_connection->policy) \&\& sk->ike->sa.st_seen_fragvid \&\& /' \
     programs/pluto/ikev2_message.c
 fi
+[ "$SWAN_VER" = "4.1" ] && sed -i 's/ sysv )/ sysvinit )/' programs/setup/setup.in
 cat > Makefile.inc.local <<'EOF'
 WERROR_CFLAGS=-w
 USE_DNSSEC=false
diff --git a/extras/vpnupgrade_centos.sh b/extras/vpnupgrade_centos.sh
index d837aa9..f39417e 100644
--- a/extras/vpnupgrade_centos.sh
+++ b/extras/vpnupgrade_centos.sh
@@ -224,6 +224,7 @@ if [ "$SWAN_VER" = "3.31" ]; then
   sed -i '1033s/if (/if (LIN(POLICY_IKE_FRAG_ALLOW, sk->ike->sa.st_connection->policy) \&\& sk->ike->sa.st_seen_fragvid \&\& /' \
     programs/pluto/ikev2_message.c
 fi
+[ "$SWAN_VER" = "4.1" ] && sed -i 's/ sysv )/ sysvinit )/' programs/setup/setup.in
 cat > Makefile.inc.local <<'EOF'
 WERROR_CFLAGS=-w
 USE_DNSSEC=false
diff --git a/vpnsetup.sh b/vpnsetup.sh
index b4df81a..f7afaf6 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -192,6 +192,7 @@ fi
 /bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
 tar xzf "$swan_file" && /bin/rm -f "$swan_file"
 cd "libreswan-$SWAN_VER" || exit 1
+sed -i 's/ sysv )/ sysvinit )/' programs/setup/setup.in
 cat > Makefile.inc.local <<'EOF'
 WERROR_CFLAGS=-w
 USE_DNSSEC=false
diff --git a/vpnsetup_centos.sh b/vpnsetup_centos.sh
index 6bf420b..e0bbf4d 100755
--- a/vpnsetup_centos.sh
+++ b/vpnsetup_centos.sh
@@ -195,6 +195,7 @@ fi
 /bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
 tar xzf "$swan_file" && /bin/rm -f "$swan_file"
 cd "libreswan-$SWAN_VER" || exit 1
+sed -i 's/ sysv )/ sysvinit )/' programs/setup/setup.in
 cat > Makefile.inc.local <<'EOF'
 WERROR_CFLAGS=-w
 USE_DNSSEC=false