diff --git a/src/hardware/brymen-bm86x/protocol.c b/src/hardware/brymen-bm86x/protocol.c
index 74101518..4538e3c4 100644
--- a/src/hardware/brymen-bm86x/protocol.c
+++ b/src/hardware/brymen-bm86x/protocol.c
@@ -257,7 +257,7 @@ static int brymen_bm86x_send_command(const struct sr_dev_inst *sdi)
 	}
 
 	if (ret != sizeof(buf)) {
-		sr_err("Short packet: sent %d/%ld bytes.", ret, sizeof(buf));
+		sr_err("Short packet: sent %d/%zu bytes.", ret, sizeof(buf));
 		return SR_ERR;
 	}
 
diff --git a/src/hardware/rigol-ds/protocol.c b/src/hardware/rigol-ds/protocol.c
index 06dc1a3e..4647966c 100644
--- a/src/hardware/rigol-ds/protocol.c
+++ b/src/hardware/rigol-ds/protocol.c
@@ -328,7 +328,7 @@ SR_PRIV int rigol_ds_capture_start(const struct sr_dev_inst *sdi)
 	if (!(devc = sdi->priv))
 		return SR_ERR;
 
-	sr_dbg("Starting data capture for frameset %lu of %lu",
+	sr_dbg("Starting data capture for frameset %" PRIu64 " of %" PRIu64,
 	       devc->num_frames + 1, devc->limit_frames);
 
 	switch (devc->model->series->protocol) {