diff --git a/hardware/appa-55ii/api.c b/hardware/appa-55ii/api.c
index 76460783..38c23b7c 100644
--- a/hardware/appa-55ii/api.c
+++ b/hardware/appa-55ii/api.c
@@ -96,7 +96,7 @@ static GSList *scan(GSList *options)
 
 	sr_info("Found device on port %s.", conn);
 
-	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "APPA", "55II", "")))
+	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "APPA", "55II", NULL)))
 		goto scan_cleanup;
 
 	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
diff --git a/hardware/asix-sigma/asix-sigma.c b/hardware/asix-sigma/asix-sigma.c
index 24d099c1..dbd4ddf9 100644
--- a/hardware/asix-sigma/asix-sigma.c
+++ b/hardware/asix-sigma/asix-sigma.c
@@ -36,7 +36,6 @@
 #define USB_DESCRIPTION			"ASIX SIGMA"
 #define USB_VENDOR_NAME			"ASIX"
 #define USB_MODEL_NAME			"SIGMA"
-#define USB_MODEL_VERSION		""
 #define TRIGGER_TYPE 			"rf10"
 #define NUM_CHANNELS			16
 
@@ -458,7 +457,7 @@ static GSList *scan(GSList *options)
 
 	/* Register SIGMA device. */
 	if (!(sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING, USB_VENDOR_NAME,
-				    USB_MODEL_NAME, USB_MODEL_VERSION))) {
+				    USB_MODEL_NAME, NULL))) {
 		sr_err("%s: sdi was NULL", __func__);
 		goto free;
 	}
diff --git a/hardware/brymen-dmm/api.c b/hardware/brymen-dmm/api.c
index ca4a742c..41a31812 100644
--- a/hardware/brymen-dmm/api.c
+++ b/hardware/brymen-dmm/api.c
@@ -75,7 +75,7 @@ static GSList *brymen_scan(const char *conn, const char *serialcomm)
 
 	sr_info("Found device on port %s.", conn);
 
-	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Brymen", "BM85x", "")))
+	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Brymen", "BM85x", NULL)))
 		goto scan_cleanup;
 
 	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
diff --git a/hardware/conrad-digi-35-cpu/api.c b/hardware/conrad-digi-35-cpu/api.c
index 2f24d189..01adcef8 100644
--- a/hardware/conrad-digi-35-cpu/api.c
+++ b/hardware/conrad-digi-35-cpu/api.c
@@ -95,7 +95,7 @@ static GSList *scan(GSList *options)
 
 	sr_spew("Conrad DIGI 35 CPU assumed at %s.", conn);
 
-	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "Conrad", "DIGI 35 CPU", "")))
+	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "Conrad", "DIGI 35 CPU", NULL)))
 		return NULL;
 
 	sdi->conn = serial;
diff --git a/hardware/gmc-mh-1x-2x/api.c b/hardware/gmc-mh-1x-2x/api.c
index 09ed9c15..3c0a7aaf 100644
--- a/hardware/gmc-mh-1x-2x/api.c
+++ b/hardware/gmc-mh-1x-2x/api.c
@@ -224,7 +224,7 @@ static GSList *scan_1x_2x_rs232(GSList *options)
 	if (model != METRAHIT_NONE) {
 		sr_spew("%s %s detected!", VENDOR_GMC, gmc_model_str(model));
 		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR_GMC,
-				gmc_model_str(model), "")))
+				gmc_model_str(model), NULL)))
 			return NULL;
 		if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 			sr_err("Device context malloc failed.");
diff --git a/hardware/mic-985xx/api.c b/hardware/mic-985xx/api.c
index 2709c530..7b0d680c 100644
--- a/hardware/mic-985xx/api.c
+++ b/hardware/mic-985xx/api.c
@@ -87,7 +87,7 @@ static GSList *mic_scan(const char *conn, const char *serialcomm, int idx)
 
 	/* TODO: Fill in version from protocol response. */
 	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, mic_devs[idx].vendor,
-				    mic_devs[idx].device, "")))
+				    mic_devs[idx].device, NULL)))
 		goto scan_cleanup;
 
 	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
diff --git a/hardware/serial-dmm/api.c b/hardware/serial-dmm/api.c
index 96138743..136d2a7c 100644
--- a/hardware/serial-dmm/api.c
+++ b/hardware/serial-dmm/api.c
@@ -392,7 +392,7 @@ static GSList *sdmm_scan(const char *conn, const char *serialcomm, int dmm)
 	sr_info("Found device on port %s.", conn);
 
 	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, dmms[dmm].vendor,
-				    dmms[dmm].device, "")))
+				    dmms[dmm].device, NULL)))
 		goto scan_cleanup;
 
 	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
diff --git a/hardware/teleinfo/api.c b/hardware/teleinfo/api.c
index 0a490729..931e5994 100644
--- a/hardware/teleinfo/api.c
+++ b/hardware/teleinfo/api.c
@@ -92,7 +92,7 @@ static GSList *scan(GSList *options)
 
 	sr_info("Found device on port %s.", conn);
 
-	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "EDF", "Teleinfo", "")))
+	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "EDF", "Teleinfo", NULL)))
 		goto scan_cleanup;
 
 	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {