diff --git a/quic/test_tools/quic_session_peer.cc b/quic/test_tools/quic_session_peer.cc
index f9e785d..70f6e5c 100644
--- a/quic/test_tools/quic_session_peer.cc
+++ b/quic/test_tools/quic_session_peer.cc
@@ -237,5 +237,11 @@
   session->is_configured_ = value;
 }
 
+// static
+void QuicSessionPeer::SetPerspective(QuicSession* session,
+                                     Perspective perspective) {
+  session->perspective_ = perspective;
+}
+
 }  // namespace test
 }  // namespace quic
diff --git a/quic/test_tools/quic_session_peer.h b/quic/test_tools/quic_session_peer.h
index 446cd67..72caa91 100644
--- a/quic/test_tools/quic_session_peer.h
+++ b/quic/test_tools/quic_session_peer.h
@@ -82,6 +82,7 @@
   static PendingStream* GetPendingStream(QuicSession* session,
                                          QuicStreamId stream_id);
   static void set_is_configured(QuicSession* session, bool value);
+  static void SetPerspective(QuicSession* session, Perspective perspective);
 };
 
 }  // namespace test