diff --git a/config.go b/config.go
index 320b5da..3598c2d 100644
--- a/config.go
+++ b/config.go
@@ -26,13 +26,19 @@ type InputParam struct {
 	Value       string
 }
 
-func (ip *InputParam) JSONUnmarshal(b []byte) error {
-	if b[0] == '"' {
+func (ip *InputParam) UnmarshalJSON(b []byte) error {
+	switch b[0] {
+	case '"':
 		ip.Description = ""
 		ip.ParamType = PARAMTYPE_CONST
-		return json.Unmarshal(b, &ip.Value)
+		tmp := ""
+		err := json.Unmarshal(b, &tmp)
+		if err != nil {
+			return err
+		}
+		ip.Value = tmp
 
-	} else if b[0] == '{' {
+	case '{':
 		read := struct {
 			Description string `json:",omitempty"`
 			ParamType   ParamType
@@ -45,9 +51,11 @@ func (ip *InputParam) JSONUnmarshal(b []byte) error {
 		*ip = read
 		return nil
 
-	} else {
+	default:
 		return errors.New("Malformed InputParam")
 	}
+
+	return nil
 }
 
 type CommandConfig struct {