diff --git a/install_wordpress_vestacp b/install_wordpress_vestacp
index ddd8141..726ca1c 100644
--- a/install_wordpress_vestacp
+++ b/install_wordpress_vestacp
@@ -25,8 +25,10 @@ fi
 
 # Define 3-character database and user prefix based on domain name
 DB_PREFIX=$(echo $DOMAIN_NAME | cut -c1-3)
-DB_NAME="${USERNAME}_${DB_PREFIX}_db"  # Prefix with username
-DB_USER="${USERNAME}_${DB_PREFIX}_usr"  # Prefix with username
+
+# Ensure the username and database name do not exceed 16 characters
+DB_NAME="${USERNAME:0:10}_${DB_PREFIX}_db"  # Limit username to 10 characters
+DB_USER="${USERNAME:0:10}_${DB_PREFIX}_usr"  # Limit username to 10 characters
 DB_PASS=$(openssl rand -base64 6 | tr -d "=+/")
 
 # Create MySQL database and user