diff --git a/src/debian/debian_dns_smartdns_plugin.conf b/src/debian/debian_dns_smartdns_plugin.conf
index aa643cd..6803690 100644
--- a/src/debian/debian_dns_smartdns_plugin.conf
+++ b/src/debian/debian_dns_smartdns_plugin.conf
@@ -30,7 +30,7 @@ git clone --depth=1 https://gitee.com/felixonmars/dnsmasq-china-list.git "$WORKD
 
 echo "Removing old configurations..."
 for _conf in "${CONF_WITH_SERVERS[@]}" "${CONF_WITH_GROUP[@]}" "${CONF_SIMPLE[@]}"; do
-  rm -f "$CONFIG_DIR"/"$_conf"*.conf
+  rm -f "$CONFIG_DIR/$_conf"*.conf
 done
 
 echo "Installing new configurations..."