diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index 211a5d7..9416a46 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -267,6 +267,7 @@
 	void *payload;
 	size_t payload_length;
 	dma_addr_t payload_bus;
+	bool payload_mapped;
 	u32 timestamp;
 
 	/*