fix

1 files changed, 7 insertions, 4 deletions

diff --git a/rrdformat/rrdbinary/decode.go b/rrdformat/rrdbinary/decode.go
index f3ae80e..cdaf49e 100644
--- a/rrdformat/rrdbinary/decode.go
+++ b/rrdformat/rrdbinary/decode.go
@@ -51,13 +51,16 @@ func (d *Decoder) Decode(ptr interface{}, tag string) error {
 	if ptrValue.Kind() != reflect.Ptr {
 		return typeErrorf("ptr is a %v, not a pointer", ptrValue.Kind())
 	}
-	return d.decode(ptrValue, tag)
+	return d.decode(ptrValue.Elem(), tag)
 }
 
 func (d *Decoder) decode(v reflect.Value, tag string) error {
-	if v.CanInterface() {
-		if u, ok := v.Interface().(unmarshaler); ok {
-			return u.unmarshalRRD(d, tag)
+	if v.Kind() != reflect.Ptr && v.CanAddr() {
+		vptr := v.Addr()
+		if vptr.CanInterface() {
+			if u, ok := vptr.Interface().(unmarshaler); ok {
+				return u.unmarshalRRD(d, tag)
+			}
 		}
 	}
 	switch v.Type().Kind() {