diff --git a/agent/src/Lib/External/AppManifest.hs b/agent/src/Lib/External/AppManifest.hs
index 5e9bafbc2..158e3b2b4 100644
--- a/agent/src/Lib/External/AppManifest.hs
+++ b/agent/src/Lib/External/AppManifest.hs
@@ -137,7 +137,7 @@ instance FromJSON LanConfiguration where
             standard =
                 withText "Standard Lan" \t -> if t == "standard" then pure Standard else fail "Not Standard Lan Conf"
             custom = withObject "Custom Lan" $ \o -> do
-                Custom <$> o .: "port"
+                Custom <$> (o .: "custom" >>= (.: "port"))
 data PortMapEntry = PortMapEntry
     { portMapEntryInternal :: Word16
     , portMapEntryTor      :: Word16
diff --git a/agent/test/Lib/External/AppManifestSpec.hs b/agent/test/Lib/External/AppManifestSpec.hs
index c0448cffe..c8d4a9fc0 100644
--- a/agent/test/Lib/External/AppManifestSpec.hs
+++ b/agent/test/Lib/External/AppManifestSpec.hs
@@ -87,6 +87,11 @@ ports:
   - internal: 80
     tor: 80
     lan: standard
+  - internal: 443
+    tor: 443
+    lan:
+      custom:
+        port: 443
   - internal: 3000
     tor: 3000
     lan: ~