diff --git a/Lib/ldap/ldapobject.py b/Lib/ldap/ldapobject.py
index e4e6841a..85b2b263 100644
--- a/Lib/ldap/ldapobject.py
+++ b/Lib/ldap/ldapobject.py
@@ -526,7 +526,7 @@ def compare_ext_s(self,dn,attr,value,serverctrls=None,clientctrls=None):
     except ldap.COMPARE_FALSE:
       return False
     raise ldap.PROTOCOL_ERROR(
-        'Compare operation returned wrong result: %r' % (ldap_res)
+        'Compare operation returned wrong result: %r' % repr(ldap_res)
     )
 
   def compare(self,dn,attr,value):