diff --git a/libraries/libldap_r/rdwr.c b/libraries/libldap_r/rdwr.c
index 81febcbd2d..45f642de4f 100644
--- a/libraries/libldap_r/rdwr.c
+++ b/libraries/libldap_r/rdwr.c
@@ -78,6 +78,8 @@ ldap_pvt_thread_rdwr_init( ldap_pvt_thread_rdwr_t *rwlock )
 
 	rw = (struct ldap_int_thread_rdwr_s *) LDAP_CALLOC( 1,
 		sizeof( struct ldap_int_thread_rdwr_s ) );
+	if ( !rw )
+		return LDAP_NO_MEMORY;
 
 	/* we should check return results */
 	ldap_pvt_thread_mutex_init( &rw->ltrw_mutex );