watch connectivity state API has changed in the meantime
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index 8e2a5f0..28c2791 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -390,7 +390,7 @@
GPR_EXPORT void GPR_CALLTYPE grpcsharp_channel_watch_connectivity_state(
grpc_channel *channel, grpc_connectivity_state last_observed_state,
gpr_timespec deadline, grpc_completion_queue *cq, grpcsharp_batch_context *ctx) {
- grpc_channel_watch_connectivity_state(channel, last_observed_state, NULL,
+ grpc_channel_watch_connectivity_state(channel, last_observed_state,
deadline, cq, ctx);
}