diff --git a/lib/irc.js b/lib/irc.js
index a45e35f7..44790ffe 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -500,8 +500,9 @@ Client.prototype.connect = function ( retryCount, callback ) { // {{{
            // callback called only after successful socket connection
            self.conn.connected = true;
            if (self.conn.authorized ||
-               (self.opt.selfSigned &&
-                self.conn.authorizationError === 'DEPTH_ZERO_SELF_SIGNED_CERT') ||
+                (self.opt.selfSigned &&
+                   (self.conn.authorizationError === 'DEPTH_ZERO_SELF_SIGNED_CERT' ||
+                      self.conn.authorizationError === 'UNABLE_TO_VERIFY_LEAF_SIGNATURE')) ||
                 (self.opt.certExpired &&
                    self.conn.authorizationError === 'CERT_HAS_EXPIRED')) {
               // authorization successful