diff --git a/src/hardware/hameg-hmo/protocol.c b/src/hardware/hameg-hmo/protocol.c
index bd2174a7..a073d0de 100644
--- a/src/hardware/hameg-hmo/protocol.c
+++ b/src/hardware/hameg-hmo/protocol.c
@@ -734,6 +734,7 @@ SR_PRIV int hmo_receive_data(int fd, int revents, void *cb_data)
 	struct sr_datafeed_logic logic;
 
 	(void)fd;
+	(void)revents;
 
 	data = NULL;
 
diff --git a/src/scpi/scpi_vxi.c b/src/scpi/scpi_vxi.c
index 9f6b2c35..b61ced01 100644
--- a/src/scpi/scpi_vxi.c
+++ b/src/scpi/scpi_vxi.c
@@ -127,7 +127,7 @@ static int scpi_vxi_send(void *priv, const char *command)
 	write_parms.lock_timeout  = VXI_DEFAULT_TIMEOUT_MS;
 	write_parms.flags         = DF_END;
 	write_parms.data.data_len = MIN(len, vxi->max_send_size);
-	write_parms.data.data_val = command;
+	write_parms.data.data_val = (char *)command;
 
 	if (!(write_resp = device_write_1(&write_parms, vxi->client))
 	    || write_resp->error) {