diff --git a/internal/xml.go b/internal/xml.go
index 7cf6e05..398d09c 100644
--- a/internal/xml.go
+++ b/internal/xml.go
@@ -131,3 +131,5 @@ func (tr *rawXMLValueReader) Token() (xml.Token, error) {
 	tr.end = true
 	return start.End(), nil
 }
+
+var _ xml.TokenReader = (*rawXMLValueReader)(nil)