diff --git a/src/core/lib/security/transport/server_auth_filter.c b/src/core/lib/security/transport/server_auth_filter.c
index 8e2ad731a577b931cbfbb45f59326e7713a4c6b5..c911dc6eeab7904b0a57ef58f0729ba6536d037d 100644
--- a/src/core/lib/security/transport/server_auth_filter.c
+++ b/src/core/lib/security/transport/server_auth_filter.c
@@ -138,13 +138,13 @@ static void on_md_processing_done(
     error_details = error_details != NULL
                         ? error_details
                         : "Authentication metadata processing failed.";
-    calld->transport_op->send_initial_metadata = NULL;
+    calld->transport_op->send_initial_metadata = false;
     if (calld->transport_op->send_message) {
       grpc_byte_stream_destroy(
           &exec_ctx, calld->transport_op->payload->send_message.send_message);
       calld->transport_op->send_message = false;
     }
-    calld->transport_op->send_trailing_metadata = NULL;
+    calld->transport_op->send_trailing_metadata = false;
     grpc_closure_sched(
         &exec_ctx, calld->on_done_recv,
         grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(error_details),