diff --git a/quic/test_tools/quic_test_utils.h b/quic/test_tools/quic_test_utils.h
index 8f1cb7a..cb51a3b 100644
--- a/quic/test_tools/quic_test_utils.h
+++ b/quic/test_tools/quic_test_utils.h
@@ -1170,6 +1170,9 @@
 QuicStreamId GetNthServerInitiatedUnidirectionalStreamId(
     QuicTransportVersion version,
     int n);
+QuicStreamId GetNthClientInitiatedUnidirectionalStreamId(
+    QuicTransportVersion version,
+    int n);
 
 StreamType DetermineStreamType(QuicStreamId id,
                                QuicTransportVersion version,