diff --git a/acme.sh b/acme.sh
index e398870f..a22b053e 100755
--- a/acme.sh
+++ b/acme.sh
@@ -7270,7 +7270,7 @@ _process() {
   done
 
   if [ "$_server" ]; then
-    _selectServer "$_server" "${_ecc-:$_keylength}"
+    _selectServer "$_server" "${_ecc:-$_keylength}"
   fi
 
   if [ "${_CMD}" != "install" ]; then