diff --git a/collector/pkg/detect/devices_darwin.go b/collector/pkg/detect/devices_darwin.go
index 73c0657..6a70f67 100644
--- a/collector/pkg/detect/devices_darwin.go
+++ b/collector/pkg/detect/devices_darwin.go
@@ -92,7 +92,7 @@ func (d *Detect) wwnFallback(detectedDevice *models.Device) {
 	block, err := ghw.Block()
 	if err == nil {
 		for _, disk := range block.Disks {
-			if disk.Name == detectedDevice.DeviceName {
+			if disk.Name == detectedDevice.DeviceName && strings.ToLower(disk.WWN) != "unknown" {
 				d.Logger.Debugf("Found matching block device. WWN: %s", disk.WWN)
 				detectedDevice.WWN = disk.WWN
 				break
diff --git a/collector/pkg/detect/devices_freebsd.go b/collector/pkg/detect/devices_freebsd.go
index 619e731..93e9a00 100644
--- a/collector/pkg/detect/devices_freebsd.go
+++ b/collector/pkg/detect/devices_freebsd.go
@@ -30,7 +30,7 @@ func (d *Detect) wwnFallback(detectedDevice *models.Device) {
 	block, err := ghw.Block()
 	if err == nil {
 		for _, disk := range block.Disks {
-			if disk.Name == detectedDevice.DeviceName {
+			if disk.Name == detectedDevice.DeviceName && strings.ToLower(disk.WWN) != "unknown" {
 				d.Logger.Debugf("Found matching block device. WWN: %s", disk.WWN)
 				detectedDevice.WWN = disk.WWN
 				break
diff --git a/collector/pkg/detect/devices_linux.go b/collector/pkg/detect/devices_linux.go
index 619e731..93e9a00 100644
--- a/collector/pkg/detect/devices_linux.go
+++ b/collector/pkg/detect/devices_linux.go
@@ -30,7 +30,7 @@ func (d *Detect) wwnFallback(detectedDevice *models.Device) {
 	block, err := ghw.Block()
 	if err == nil {
 		for _, disk := range block.Disks {
-			if disk.Name == detectedDevice.DeviceName {
+			if disk.Name == detectedDevice.DeviceName && strings.ToLower(disk.WWN) != "unknown" {
 				d.Logger.Debugf("Found matching block device. WWN: %s", disk.WWN)
 				detectedDevice.WWN = disk.WWN
 				break