diff --git a/DepotDownloader/ContentDownloader.cs b/DepotDownloader/ContentDownloader.cs
index d89a8bce..17f77214 100644
--- a/DepotDownloader/ContentDownloader.cs
+++ b/DepotDownloader/ContentDownloader.cs
@@ -193,12 +193,12 @@ namespace DepotDownloader
             KeyValue branches = depots["branches"];
             KeyValue node = branches[branch];
 
-            if (node == null)
+            if (node == KeyValue.Invalid)
                 return 0;
 
             KeyValue buildid = node["buildid"];
 
-            if (buildid == null)
+            if (buildid == KeyValue.Invalid)
                 return 0;
 
             return uint.Parse(buildid.Value);