diff --git a/quiche/quic/core/http/quic_connection_migration_manager.cc b/quiche/quic/core/http/quic_connection_migration_manager.cc
index d62594e..bf116f6 100644
--- a/quiche/quic/core/http/quic_connection_migration_manager.cc
+++ b/quiche/quic/core/http/quic_connection_migration_manager.cc
@@ -204,7 +204,7 @@
     QuicSpdyClientSessionWithMigration* absl_nonnull session,
     const quic::QuicClock* absl_nonnull clock,
     QuicNetworkHandle default_network, QuicNetworkHandle current_network,
-    QuicPathContextFactory* absl_nonnull path_context_factory,
+    QuicPathContextFactory* absl_nullable path_context_factory,
     const QuicConnectionMigrationConfig& config)
     : session_(session),
       connection_(session->connection()),
diff --git a/quiche/quic/core/http/quic_connection_migration_manager.h b/quiche/quic/core/http/quic_connection_migration_manager.h
index 2bab3ea..4a29328 100644
--- a/quiche/quic/core/http/quic_connection_migration_manager.h
+++ b/quiche/quic/core/http/quic_connection_migration_manager.h
@@ -168,11 +168,13 @@
 // network or port.
 class QUICHE_EXPORT QuicConnectionMigrationManager {
  public:
+  // `path_context_factory` can be nullptr, in which case no migration will be
+  // performed regardless of the migration `config`.
   QuicConnectionMigrationManager(
       QuicSpdyClientSessionWithMigration* absl_nonnull session,
       const quic::QuicClock* absl_nonnull clock,
       QuicNetworkHandle default_network, QuicNetworkHandle current_network,
-      QuicPathContextFactory* absl_nonnull path_context_factory,
+      QuicPathContextFactory* absl_nullable path_context_factory,
       const QuicConnectionMigrationConfig& config);
 
   ~QuicConnectionMigrationManager();
@@ -368,7 +370,8 @@
   QuicNetworkHandle default_network_;
   // Stores the network interface that is currently used by the connection.
   QuicNetworkHandle current_network_;
-  QuicPathContextFactory* absl_nonnull path_context_factory_;
+  // Nullptr if no migration is allowed.
+  QuicPathContextFactory* absl_nullable path_context_factory_;
   // Not owned.
   QuicConnectionMigrationDebugVisitor* absl_nullable debug_visitor_ = nullptr;
   const QuicConnectionMigrationConfig config_;