diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
index 48f2a1f..f2912ab 100644
--- a/include/sound/compress_driver.h
+++ b/include/sound/compress_driver.h
@@ -61,6 +61,7 @@
 	u64 total_bytes_available;
 	u64 total_bytes_transferred;
 	wait_queue_head_t sleep;
+	void *private_data;
 };
 
 /**