diff --git a/vendor/plugins/ruby-net-ldap-0.0.4/lib/net/ber.rb b/vendor/plugins/ruby-net-ldap-0.0.4/lib/net/ber.rb
index e76100656..6589415dc 100644
--- a/vendor/plugins/ruby-net-ldap-0.0.4/lib/net/ber.rb
+++ b/vendor/plugins/ruby-net-ldap-0.0.4/lib/net/ber.rb
@@ -68,7 +68,7 @@ module Net
     # this can throw TypeErrors and other nasties.
     #
     def read_ber syntax=nil
-      return nil if eof?
+      return nil if (StringIO == self.class) and  eof?
 
       id = getc  # don't trash this value, we'll use it later
       tag = id & 31