diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 68bb916501c292d7eb00ab058ea415e9f3ad07e1..9c49c705643d498c5476fee8a0177d5d22c60402 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -4567,6 +4567,13 @@ networkAllocatePort(virNetworkObjPtr obj,
             return -1;
         }
 
+        if (!port->bandwidth) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("QOS must be defined for network '%s'"),
+                           netdef->name);
+            return -1;
+        }
+
         if (networkPlugBandwidth(obj, &port->mac, port->bandwidth, &port->class_id) < 0)
             return -1;
         break;
@@ -4633,6 +4640,13 @@ networkAllocatePort(virNetworkObjPtr obj,
                 }
             }
 
+            if (!port->bandwidth) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("QOS must be defined for network '%s'"),
+                               netdef->name);
+                return -1;
+            }
+
             if (networkPlugBandwidth(obj, &port->mac, port->bandwidth, &port->class_id) < 0)
                 return -1;
             break;