diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index e9ecd940465481ae6fbcf4ec0f4e256ce65b2b70..34accb2e3786cf4efee7de557dc7a16355f2dea7 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1134,6 +1134,10 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
         }
     }
 
+    if (net->mtu &&
+        virNetDevSetMTU(net->ifname, net->mtu) < 0)
+        goto cleanup;
+
     for (i = 0; i < tapfdSize; i++) {
         if (qemuSecuritySetTapFDLabel(driver->securityManager,
                                       vm->def, tapfd[i]) < 0)