diff --git a/include/linux/hdlcdrv.h b/include/linux/hdlcdrv.h
index 0821bac62b83449bfad09dad77eab8b7e244499a..c010b4a785b8f7d5c7142232fdfd85fc412d69d4 100644
--- a/include/linux/hdlcdrv.h
+++ b/include/linux/hdlcdrv.h
@@ -215,7 +215,7 @@ struct hdlcdrv_state {
 
 	struct hdlcdrv_hdlctx {
 		struct hdlcdrv_hdlcbuffer hbuf;
-		long in_hdlc_tx;
+		unsigned long in_hdlc_tx;
 		/*
 		 * 0 = send flags
 		 * 1 = send txtail (flags)