diff --git a/collectors/smartmonMetric.go b/collectors/smartmonMetric.go
index db49bef..346d157 100644
--- a/collectors/smartmonMetric.go
+++ b/collectors/smartmonMetric.go
@@ -1,6 +1,7 @@
 package collectors
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"os/exec"
@@ -129,7 +130,9 @@ func (m *SmartMonCollector) Init(config json.RawMessage) error {
 
 	// Read in the JSON configuration
 	if len(config) > 0 {
-		if err := json.Unmarshal(config, &m.config); err != nil {
+		d := json.NewDecoder(bytes.NewReader(config))
+		d.DisallowUnknownFields()
+		if err := d.Decode(&m.config); err != nil {
 			return fmt.Errorf("%s Init(): Error reading config: %w", m.name, err)
 		}
 	}