diff --git a/ct/openthread-br.sh b/ct/openthread-br.sh
index e9641e4cc..f63fb8421 100644
--- a/ct/openthread-br.sh
+++ b/ct/openthread-br.sh
@@ -38,6 +38,13 @@ function update_script() {
     systemctl stop otbr-agent
     msg_ok "Stopped Services"
 
+    if [[ -f /etc/init.d/otbr-agent ]] || [[ -f /etc/init.d/otbr-web ]]; then
+      msg_info "Removing legacy services"
+      rm -f /etc/init.d/otbr-agent /etc/init.d/otbr-web
+      systemctl daemon-reload
+      msg_ok "Removed legacy services"
+    fi
+
     msg_info "Backing up Configuration"
     cp /etc/default/otbr-agent /etc/default/otbr-agent.bak
     msg_ok "Backed up Configuration"
@@ -61,6 +68,7 @@ function update_script() {
     -DOTBR_WEB=ON \
     -DOTBR_BORDER_ROUTING=ON \
     -DOTBR_BACKBONE_ROUTER=ON \
+    -DOTBR_SYSTEMD_UNIT_DIR=/etc/systemd/system \
     -DOT_FIREWALL=ON \
     -DOT_POSIX_NAT64_CIDR="192.168.255.0/24" \
     ..
diff --git a/install/openthread-br-install.sh b/install/openthread-br-install.sh
index 8e68e3250..a36c5fe1f 100644
--- a/install/openthread-br-install.sh
+++ b/install/openthread-br-install.sh
@@ -64,6 +64,7 @@ $STD cmake -GNinja \
   -DOTBR_WEB=ON \
   -DOTBR_BORDER_ROUTING=ON \
   -DOTBR_BACKBONE_ROUTER=ON \
+  -DOTBR_SYSTEMD_UNIT_DIR=/etc/systemd/system \
   -DOT_FIREWALL=ON \
   -DOT_POSIX_NAT64_CIDR="192.168.255.0/24" \
   ..