diff --git a/src/xen/xend_internal.c b/src/xen/xend_internal.c
index c30b136ef22e643990658f5b96824e3b1d6c28e2..0390c710e6923e21e1af271756f44af5ed96375e 100644
--- a/src/xen/xend_internal.c
+++ b/src/xen/xend_internal.c
@@ -3338,9 +3338,10 @@ virDomainXMLDevID(virConnectPtr conn,
     xenUnifiedPrivatePtr priv = conn->privateData;
     char *xref;
     char *tmp;
-    const char *driver = virDomainDiskGetDriver(dev->data.disk);
 
     if (dev->type == VIR_DOMAIN_DEVICE_DISK) {
+        const char *driver = virDomainDiskGetDriver(dev->data.disk);
+
         if (STREQ_NULLABLE(driver, "tap") || STREQ_NULLABLE(driver, "tap2"))
             strcpy(class, driver);
         else