diff --git a/libraries/libldap/tls2.c b/libraries/libldap/tls2.c
index 09ad9a14ba..f6dbf21f99 100644
--- a/libraries/libldap/tls2.c
+++ b/libraries/libldap/tls2.c
@@ -43,7 +43,9 @@ static tls_impl *tls_imp = &ldap_int_tls_impl;
 
 #endif /* HAVE_TLS */
 
+#ifndef HAVE_MOZNSS
 #define LDAP_USE_NON_BLOCKING_TLS
+#endif
 
 /* RFC2459 minimum required set of supported attribute types
  * in a certificate DN