diff --git a/acme.sh b/acme.sh
index 4cf407f2..d1565039 100755
--- a/acme.sh
+++ b/acme.sh
@@ -2361,7 +2361,7 @@ _clear_conf() {
   _sdkey="$2"
   if [ "$_c_c_f" ]; then
     _conf_data="$(cat "$_c_c_f")"
-    echo "$_conf_data" | sed "s/^$_sdkey *=.*$//" >"$_c_c_f"
+    echo "$_conf_data" | sed "/^$_sdkey *=.*$/d" >"$_c_c_f"
   else
     _err "Config file is empty, cannot clear"
   fi