diff --git a/readjson.go b/readjson.go
index 3f6b3ee..234bc85 100644
--- a/readjson.go
+++ b/readjson.go
@@ -64,7 +64,7 @@ func readFakeSMARTctl(logger log.Logger, device Device) gjson.Result {
 // Get json from smartctl and parse it
 func readSMARTctl(logger log.Logger, device Device) (gjson.Result, bool) {
 	start := time.Now()
-	out, err := exec.Command(*smartctlPath, "--json", "--info", "--health", "--attributes", "--tolerance=verypermissive", "--nocheck=standby", "--format=brief", "--log=error", device.Name, "-d", device.Type).Output()
+	out, err := exec.Command(*smartctlPath, "--json", "--info", "--health", "--attributes", "--tolerance=verypermissive", "--nocheck=standby", "--format=brief", "--log=error", "--device="+device.Type, device.Name).Output()
 	if err != nil {
 		level.Warn(logger).Log("msg", "S.M.A.R.T. output reading", "err", err, "device", device.Info_Name)
 	}