diff --git a/ext/libstrawberry-tagreader/tagreaderbase.h b/ext/libstrawberry-tagreader/tagreaderbase.h
index 6e0b5a546..1d6104db7 100644
--- a/ext/libstrawberry-tagreader/tagreaderbase.h
+++ b/ext/libstrawberry-tagreader/tagreaderbase.h
@@ -46,6 +46,8 @@ class TagReaderBase {
 
  protected:
   static const std::string kEmbeddedCover;
+
+  Q_DISABLE_COPY(TagReaderBase)
 };
 
 #endif  // TAGREADERBASE_H
diff --git a/ext/libstrawberry-tagreader/tagreadertaglib.h b/ext/libstrawberry-tagreader/tagreadertaglib.h
index f23acf69c..2707043a3 100644
--- a/ext/libstrawberry-tagreader/tagreadertaglib.h
+++ b/ext/libstrawberry-tagreader/tagreadertaglib.h
@@ -75,6 +75,8 @@ class TagReaderTagLib : public TagReaderBase {
 
  private:
   FileRefFactory *factory_;
+
+  Q_DISABLE_COPY(TagReaderTagLib)
 };
 
 #endif  // TAGREADERTAGLIB_H
diff --git a/ext/libstrawberry-tagreader/tagreadertagparser.h b/ext/libstrawberry-tagreader/tagreadertagparser.h
index 999a3c61e..3534dd86b 100644
--- a/ext/libstrawberry-tagreader/tagreadertagparser.h
+++ b/ext/libstrawberry-tagreader/tagreadertagparser.h
@@ -45,7 +45,7 @@ class TagReaderTagParser : public TagReaderBase {
   QByteArray LoadEmbeddedArt(const QString &filename) const override;
   bool SaveEmbeddedArt(const QString &filename, const QByteArray &data) override;
 
- private:
+  Q_DISABLE_COPY(TagReaderTagParser)
 };
 
 #endif  // TAGREADERTAGPARSER_H