diff --git a/usr/local/share/bastille/network.sh b/usr/local/share/bastille/network.sh
index 623c5b82..881f29d7 100644
--- a/usr/local/share/bastille/network.sh
+++ b/usr/local/share/bastille/network.sh
@@ -239,7 +239,7 @@ add_interface() {
     if [ "${BRIDGE}" -eq 1 ]; then
        if [ "${_epair_count}" -gt 0 ]; then  
             for _num in $(seq 0 "${_epair_num_range}"); do
-                if ! echo "${_epair_list}" | grep -osq "${_num}"; then
+                if ! echo "${_epair_list}" | grep -oqswx "${_num}"; then
                     if [ "$(echo -n "e${_num}a_${jail_name}" | awk '{print length}')" -lt 16 ]; then
                         local host_epair=e${_num}a_${_jailname}
                         local jail_epair=e${_num}b_${_jailname}
@@ -312,7 +312,7 @@ EOF
 
     elif [ "${VNET}" -eq 1 ]; then
         for _num in $(seq 0 "${_epair_num_range}"); do
-            if ! echo "${_epair_list}" | grep -osq "${_num}"; then
+            if ! echo "${_epair_list}" | grep -oqswx "${_num}"; then
                     local bastille_epair="bastille${_num}"
                     break
             fi