diff --git a/third_party/machinarium/sources/machinarium.h b/third_party/machinarium/sources/machinarium.h
index 94b15276..335646ca 100644
--- a/third_party/machinarium/sources/machinarium.h
+++ b/third_party/machinarium/sources/machinarium.h
@@ -130,6 +130,12 @@ machine_msg_get_data(machine_msg_t*);
 MACHINE_API int
 machine_msg_get_type(machine_msg_t*);
 
+MACHINE_API int
+machine_msg_ensure(machine_msg_t*, int size);
+
+MACHINE_API void
+machine_msg_write(machine_msg_t*, char *buf, int size);
+
 /* channel */
 
 MACHINE_API machine_channel_t*
diff --git a/third_party/machinarium/sources/msg.c b/third_party/machinarium/sources/msg.c
index d6a0cea1..2d275b31 100644
--- a/third_party/machinarium/sources/msg.c
+++ b/third_party/machinarium/sources/msg.c
@@ -47,3 +47,19 @@ machine_msg_get_type(machine_msg_t *obj)
 	mm_msg_t *msg = mm_cast(mm_msg_t*, obj);
 	return msg->type;
 }
+
+MACHINE_API int
+machine_msg_ensure(machine_msg_t *obj, int size)
+{
+	mm_msg_t *msg = mm_cast(mm_msg_t*, obj);
+	return mm_buf_ensure(&msg->data, size);
+}
+
+MACHINE_API void
+machine_msg_write(machine_msg_t *obj, char *buf, int size)
+{
+	mm_msg_t *msg = mm_cast(mm_msg_t*, obj);
+	int rc = mm_buf_add(&msg->data, buf, size);
+	(void)rc;
+	assert(rc == 0);
+}