diff --git a/src/udi/handlers/svej/svej.go b/src/udi/handlers/svej/svej.go
index 6d22485..f3577f2 100644
--- a/src/udi/handlers/svej/svej.go
+++ b/src/udi/handlers/svej/svej.go
@@ -152,12 +152,12 @@ func (self *SingleValueExtractorJsonpathHandler) Handle(message handler.MessageT
 		return
 	}
 
-	measurement.Device = device
+	measurement.Device = device.(string)
 
 	var variable database.VariableType
 	variable.Label = ""
 	variable.Variable = ""
-	variable.Unit = unit
+	variable.Unit = unit.(string)
 	variable.Value = value
 	measurement.Values = make(map[string]database.VariableType)
 	measurement.Values["Value"] = variable