diff --git a/fritzbox_upnp/service.go b/fritzbox_upnp/service.go
index 116b1fd..eff6db2 100644
--- a/fritzbox_upnp/service.go
+++ b/fritzbox_upnp/service.go
@@ -256,11 +256,12 @@ func convertResult(val string, arg *Argument) (interface{}, error) {
 		return bool(val == "1"), nil
 
 	case "ui1", "ui2", "ui4":
-		res, err := strconv.ParseUint(val, 10, 32)
+        // type ui4 can contain values greater than 2^32!
+		res, err := strconv.ParseUint(val, 10, 64)
 		if err != nil {
 			return nil, err
 		}
-		return uint32(res), nil
+		return uint64(res), nil
 	default:
 		return nil, fmt.Errorf("unknown datatype: %s", arg.StateVariable.DataType)
 
diff --git a/main.go b/main.go
index aead9d1..cc936b9 100644
--- a/main.go
+++ b/main.go
@@ -199,7 +199,7 @@ func (fc *FritzboxCollector) Collect(ch chan<- prometheus.Metric) {
 
 		var floatval float64
 		switch tval := val.(type) {
-		case uint32:
+		case uint64:
 			floatval = float64(tval)
 		case bool:
 			if tval {