diff --git a/images/toolbox/toolbox.sh b/images/toolbox/toolbox.sh
index f4d801796..e990611b4 100755
--- a/images/toolbox/toolbox.sh
+++ b/images/toolbox/toolbox.sh
@@ -28,7 +28,7 @@ KEYRING_FILE="/etc/ceph/keyring"
 # without specifying any arguments
 write_endpoints() {  
     endpoints=$(cat ${MON_CONFIG})
-    mon_endpoints=$(echo ${endpoints} | sed 's/rook-ceph-mon[0-9]=//g')
+    mon_endpoints=$(echo ${endpoints} | sed 's/rook-ceph-mon[0-9]\+=//g')
     DATE=$(date)
     echo "$DATE writing mon endpoints to ${CEPH_CONFIG}: ${endpoints}"
     cat <<EOF > ${CEPH_CONFIG}