diff --git a/include/Flow.h b/include/Flow.h
index f689948c06..621782f245 100644
--- a/include/Flow.h
+++ b/include/Flow.h
@@ -83,7 +83,6 @@ class Flow : public GenericHashEntry {
   CounterTrend throughputTrend, goodputTrend, thptRatioTrend;
 #endif
   ndpi_protocol ndpiDetectedProtocol;
-  static const ndpi_protocol ndpiUnknownProtocol;
   custom_app_t custom_app;
   void *cli_id, *srv_id;
   char *json_info, *host_server_name, *bt_hash;
@@ -242,6 +241,7 @@ class Flow : public GenericHashEntry {
   FlowStatus getFlowStatus();
   struct site_categories* getFlowCategory(bool force_categorization);
   void freeDPIMemory();
+  static const ndpi_protocol ndpiUnknownProtocol;
   bool isTiny() const;
   bool isLongLived() const;
   inline bool isSSL()  const { return(isProto(NDPI_PROTOCOL_SSL));  }
diff --git a/src/NetworkInterface.cpp b/src/NetworkInterface.cpp
index eb2e36ab29..72fb49108d 100644
--- a/src/NetworkInterface.cpp
+++ b/src/NetworkInterface.cpp
@@ -1055,10 +1055,11 @@ NetworkInterface* NetworkInterface::getSubInterface(u_int32_t criteria, bool par
 	  h->iface = new NetworkInterface(buf, vIface_type);
 
 	if(h->iface) {
-	  if (ntop->registerInterface(h->iface))
+	  if(ntop->registerInterface(h->iface))
             ntop->initInterface(h->iface);
 	  h->iface->allocateStructures();
 	  h->iface->setDynamicInterface();
+	  h->iface->startPacketPolling(); /* Won't actually start a thread, just mark this interface as running */
 	  HASH_ADD_INT(flowHashing, criteria, h);
 	  numVirtualInterfaces++;
 	  ntop->getRedis()->set(CONST_STR_RELOAD_LISTS, (const char * const)"1");
@@ -1084,13 +1085,11 @@ NetworkInterface* NetworkInterface::getSubInterface(u_int32_t criteria, bool par
 void NetworkInterface::processFlow(ParsedFlow *zflow, bool zmq_flow) {
   bool src2dst_direction, new_flow;
   Flow *flow;
-  ndpi_protocol p;
+  ndpi_protocol p = Flow::ndpiUnknownProtocol;
   time_t now = time(NULL);
   Mac *srcMac = NULL, *dstMac = NULL;
   IpAddress srcIP, dstIP;
 
-  memset(&p, 0, sizeof(p));
-
   if(zmq_flow) {
     /* In ZMQ flows we need to fix the clock drift */