diff --git a/server/request.h b/server/request.h
index 29ed8c9..3984ab1 100644
--- a/server/request.h
+++ b/server/request.h
@@ -670,7 +670,8 @@
 C_ASSERT( FIELD_OFFSET(struct init_thread_reply, server_start) == 16 );
 C_ASSERT( FIELD_OFFSET(struct init_thread_reply, info_size) == 24 );
 C_ASSERT( FIELD_OFFSET(struct init_thread_reply, version) == 28 );
-C_ASSERT( sizeof(struct init_thread_reply) == 32 );
+C_ASSERT( FIELD_OFFSET(struct init_thread_reply, all_cpus) == 32 );
+C_ASSERT( sizeof(struct init_thread_reply) == 40 );
 C_ASSERT( FIELD_OFFSET(struct terminate_process_request, handle) == 12 );
 C_ASSERT( FIELD_OFFSET(struct terminate_process_request, exit_code) == 16 );
 C_ASSERT( FIELD_OFFSET(struct terminate_process_reply, self) == 8 );