diff --git a/src/openvz/openvz_driver.c b/src/openvz/openvz_driver.c
index c1d91e46839ac3bad49f1c5cab7aa74a49a26c6d..d50ecf16ffb919ab358977671f5062991e9fcb79 100644
--- a/src/openvz/openvz_driver.c
+++ b/src/openvz/openvz_driver.c
@@ -613,12 +613,15 @@ cleanup:
 }
 
 static int openvzDomainReboot(virDomainPtr dom,
-                              unsigned int flags ATTRIBUTE_UNUSED) {
+                              unsigned int flags)
+{
     struct openvz_driver *driver = dom->conn->privateData;
     virDomainObjPtr vm;
     const char *prog[] = {VZCTL, "--quiet", "restart", PROGRAM_SENTINAL, NULL};
     int ret = -1;
 
+    virCheckFlags(0, -1);
+
     openvzDriverLock(driver);
     vm = virDomainFindByUUID(&driver->domains, dom->uuid);
     openvzDriverUnlock(driver);
@@ -1283,10 +1286,12 @@ openvzDomainSetVcpus(virDomainPtr dom, unsigned int nvcpus)
 
 static virDrvOpenStatus openvzOpen(virConnectPtr conn,
                                    virConnectAuthPtr auth ATTRIBUTE_UNUSED,
-                                   unsigned int flags ATTRIBUTE_UNUSED)
+                                   unsigned int flags)
 {
     struct openvz_driver *driver;
 
+    virCheckFlags(VIR_CONNECT_RO, VIR_DRV_OPEN_ERROR);
+
     if (conn->uri == NULL) {
         if (!virFileExists("/proc/vz"))
             return VIR_DRV_OPEN_DECLINED;