diff --git a/fboss/agent/ApplyThriftConfig.cpp b/fboss/agent/ApplyThriftConfig.cpp
index 5a46d326cc8f7..0b9823305d42f 100644
--- a/fboss/agent/ApplyThriftConfig.cpp
+++ b/fboss/agent/ApplyThriftConfig.cpp
@@ -4842,6 +4842,8 @@ std::shared_ptr<Mirror> ThriftConfigApplier::updateMirror(
     }
     if (orig->getEgressPort()) {
       newMirror->setEgressPort(orig->getEgressPort().value());
+      newMirror->setEgressPortDesc(
+          PortDescriptor(orig->getEgressPort().value()));
     }
   }
   if (*newMirror == *orig) {
diff --git a/fboss/agent/MirrorManagerImpl.cpp b/fboss/agent/MirrorManagerImpl.cpp
index 43dc69ea05bed..1143ca9a76f72 100644
--- a/fboss/agent/MirrorManagerImpl.cpp
+++ b/fboss/agent/MirrorManagerImpl.cpp
@@ -147,6 +147,7 @@ std::shared_ptr<Mirror> MirrorManagerImpl<AddrT>::updateMirror(
         entry,
         newMirror->getTunnelUdpPorts()));
     newMirror->setEgressPort(egressPort.value());
+    newMirror->setEgressPortDesc(PortDescriptor(egressPort.value()));
     break;
   }
 
@@ -155,6 +156,7 @@ std::shared_ptr<Mirror> MirrorManagerImpl<AddrT>::updateMirror(
       asic->isSupported(HwAsic::Feature::EVENTOR_PORT_FOR_SFLOW)) {
     auto eventorPort = getEventorPortForSflowMirror(mirror->getSwitchId());
     newMirror->setEgressPort(eventorPort);
+    newMirror->setEgressPortDesc(PortDescriptor(eventorPort));
     newMirror->setDestinationMac(
         getEventorPortInterfaceMac(state, eventorPort));
   }