diff --git a/run-vsftpd.sh b/run-vsftpd.sh
index 9ec8616..5d9656f 100644
--- a/run-vsftpd.sh
+++ b/run-vsftpd.sh
@@ -21,7 +21,10 @@ fi
 mkdir -p "/home/vsftpd/${FTP_USER}"
 chown -R ftp:ftp /home/vsftpd/
 
-echo -e "${FTP_USER}\n${FTP_PASS}" > /etc/vsftpd/virtual_users.txt
+if ! grep -Fxq "${FTP_USER}" /etc/vsftpd/virtual_users.txt
+then
+    echo -e "${FTP_USER}\n${FTP_PASS}" >> /etc/vsftpd/virtual_users.txt
+fi
 /usr/bin/db_load -T -t hash -f /etc/vsftpd/virtual_users.txt /etc/vsftpd/virtual_users.db
 
 # Set passive mode parameters: