diff --git a/lib/ecdsacsr.js b/lib/ecdsacsr.js
index 6321263..709838e 100644
--- a/lib/ecdsacsr.js
+++ b/lib/ecdsacsr.js
@@ -286,13 +286,13 @@ function createCsrBodyEc(domains, xy) {
       // Subject
       // #1 Total 2+11+n
     , ASN1('30'
-      , '31 {4.3.0setlen}'                                            // 2 bytes, set
-        .replace(/{[^}]+}/, numToHex(2+5+2+sublen))
+      , ASN1('31'
         , ASN1('30'
             // object id (commonName)
           , ASN1('06', '55 04 03')
           , ASN1('0C', strToHex(domains[0]))
           )
+        )
       )
 
       // P-256 Public Key