diff --git a/subcmds/diffmanifests.py b/subcmds/diffmanifests.py
index 751a202..a1e823c 100644
--- a/subcmds/diffmanifests.py
+++ b/subcmds/diffmanifests.py
@@ -190,12 +190,12 @@
       self.printProject = self.printAdded = self.printRemoved = self.printRevision = self.printText
 
     manifest1 = XmlManifest(self.manifest.repodir)
-    manifest1.Override(args[0])
+    manifest1.Override(args[0], load_local_manifests=False)
     if len(args) == 1:
       manifest2 = self.manifest
     else:
       manifest2 = XmlManifest(self.manifest.repodir)
-      manifest2.Override(args[1])
+      manifest2.Override(args[1], load_local_manifests=False)
 
     diff = manifest1.projectsDiff(manifest2)
     if opt.raw: