diff --git a/lib/net/ldap.rb b/lib/net/ldap.rb
index b0105fc..0f1fe65 100644
--- a/lib/net/ldap.rb
+++ b/lib/net/ldap.rb
@@ -1529,7 +1529,9 @@ class Net::LDAP::Connection #:nodoc:
     pkt = [next_msgid.to_ber, request.to_ber_appsequence(12)].to_ber_sequence
     @conn.write pkt
 
-    (be = @conn.read_ber(AsnSyntax)) && (pdu = LdapPdu.new( be )) && (pdu.app_tag == 13) or raise LdapError.new( "response missing or invalid" )
+    (be = @conn.read_ber(Net::LDAP::AsnSyntax)) &&
+    (pdu = Net::LDAP::PDU.new( be )) && (pdu.app_tag == 13) or
+    raise Net::LDAP::LdapError.new( "response missing or invalid" )
     pdu.result_code
   end