diff --git a/taglib/fileref.h b/taglib/fileref.h
index e4bb0d9a..0fe000ef 100644
--- a/taglib/fileref.h
+++ b/taglib/fileref.h
@@ -143,7 +143,7 @@ namespace TagLib {
       /*!
        * Destroys this StreamTypeResolver instance.
        */
-      ~StreamTypeResolver() override = 0;
+      virtual ~StreamTypeResolver() override = 0; // virtual is needed by SWIG
 
       StreamTypeResolver(const StreamTypeResolver &) = delete;
       StreamTypeResolver &operator=(const StreamTypeResolver &) = delete;