diff --git a/quic/test_tools/quic_session_peer.cc b/quic/test_tools/quic_session_peer.cc
index ab28828..ea9dc06 100644
--- a/quic/test_tools/quic_session_peer.cc
+++ b/quic/test_tools/quic_session_peer.cc
@@ -242,12 +242,17 @@
     }
   }
   // Exclude draining streams.
-  result -= session->GetNumDrainingStreams();
+  result -= session->num_draining_streams_;
   // Add locally closed streams.
   result += session->locally_closed_streams_highest_offset_.size();
 
   return result;
 }
 
+// static
+size_t QuicSessionPeer::GetNumDrainingStreams(QuicSession* session) {
+  return session->num_draining_streams_;
+}
+
 }  // namespace test
 }  // namespace quic