diff --git a/AirportItlwm/AirportItlwm.cpp b/AirportItlwm/AirportItlwm.cpp
index 24694a380..f20251a65 100644
--- a/AirportItlwm/AirportItlwm.cpp
+++ b/AirportItlwm/AirportItlwm.cpp
@@ -693,8 +693,8 @@ IOReturn AirportItlwm::outputStart(IONetworkInterface *interface, IOOptionBits o
     if (ifq_is_oactive(&ifp->if_snd))
         return kIOReturnNoResources;
     while (kIOReturnSuccess == interface->dequeueOutputPackets(1, &m)) {
-        outputPacket(m, NULL);
-        if (ifq_is_oactive(&ifp->if_snd))
+        if (outputPacket(m, NULL)!= kIOReturnOutputSuccess ||
+            ifq_is_oactive(&ifp->if_snd))
             return kIOReturnNoResources;
     }
     return kIOReturnSuccess;
diff --git a/itlwm/itlwm.cpp b/itlwm/itlwm.cpp
index d2d3b3967..082211684 100644
--- a/itlwm/itlwm.cpp
+++ b/itlwm/itlwm.cpp
@@ -593,8 +593,8 @@ IOReturn itlwm::outputStart(IONetworkInterface *interface, IOOptionBits options)
     if (ifq_is_oactive(&ifp->if_snd))
         return kIOReturnNoResources;
     while (kIOReturnSuccess == interface->dequeueOutputPackets(1, &m)) {
-        outputPacket(m, NULL);
-        if (ifq_is_oactive(&ifp->if_snd))
+        if (outputPacket(m, NULL)!= kIOReturnOutputSuccess ||
+            ifq_is_oactive(&ifp->if_snd))
             return kIOReturnNoResources;
     }
     return kIOReturnSuccess;