diff --git a/src/hardware/agilent-dmm/api.c b/src/hardware/agilent-dmm/api.c
index 1c18c99c..c89d18ed 100644
--- a/src/hardware/agilent-dmm/api.c
+++ b/src/hardware/agilent-dmm/api.c
@@ -116,7 +116,7 @@ static GSList *scan(GSList *options)
 		return NULL;
 
 	serial_flush(serial);
-	if (serial_write(serial, "*IDN?\r\n", 7) == -1) {
+	if (serial_write_blocking(serial, "*IDN?\r\n", 7) == -1) {
 		sr_err("Unable to send identification string: %s.",
 		       strerror(errno));
 		return NULL;