diff --git a/src/TRLDAPConnection.m b/src/TRLDAPConnection.m
index 097f201..42c782f 100644
--- a/src/TRLDAPConnection.m
+++ b/src/TRLDAPConnection.m
@@ -415,7 +415,7 @@ - (BOOL) compare: (TRString *) dn withAttribute: (TRString *) attribute value: (
     }
 
     /* Wait for the result */
-    if (ldap_result(ldapConn, msgid, 1, &timeout, &res) == -1) {
+    if (ldap_result(ldapConn, msgid, 1, &timeout, &res) <= 0) {
         err = ldap_get_errno(ldapConn);
         if (err == LDAP_TIMEOUT)
             ldap_abandon_ext(ldapConn, msgid, NULL, NULL);