diff --git a/openbsc/src/libabis/input/hsl.c b/openbsc/src/libabis/input/hsl.c
index 2b9ab1d..c53fd0f 100644
--- a/openbsc/src/libabis/input/hsl.c
+++ b/openbsc/src/libabis/input/hsl.c
@@ -298,7 +298,7 @@
 	struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
 	struct e1inp_sign_link *sign_link;
 	struct msgb *msg;
-	u_int8_t proto;
+	uint8_t proto;
 	int ret;
 
 	bfd->when &= ~BSC_FD_WRITE;