diff --git a/src/hardware/fluke-45/api.c b/src/hardware/fluke-45/api.c
index 164cd5f9..9e045f07 100644
--- a/src/hardware/fluke-45/api.c
+++ b/src/hardware/fluke-45/api.c
@@ -31,6 +31,12 @@
 #include "scpi.h"
 #include "protocol.h"
 
+/*
+ * This test violates the SCPI protocol, and confuses other devices.
+ * Disable it for now, until a better location was found.
+ */
+#define ECHO_TEST 0
+
 static const uint32_t scanopts[] = {
 	SR_CONF_CONN,
 	SR_CONF_SERIALCOMM,
@@ -62,11 +68,14 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 	unsigned int i;
 	const struct fluke_scpi_dmm_model *model = NULL;
 	gchar *channel_name;
+#if ECHO_TEST
 	char *response;
+#endif
 
 	sdi = g_malloc0(sizeof(struct sr_dev_inst));
 	sdi->conn = scpi;
 
+#if ECHO_TEST
 	/* Test for serial port ECHO enabled. */
 	response = NULL;
 	sr_scpi_get_string(scpi, "ECHO-TEST", &response);
@@ -74,6 +83,7 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 		sr_err("Serial port ECHO is ON. Please turn it OFF!");
 		return NULL;
 	}
+#endif
 
 	/* Get device IDN. */
 	if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {