diff --git a/toonz/sources/include/tstream.h b/toonz/sources/include/tstream.h
index 7f85a64..4f9b412 100644
--- a/toonz/sources/include/tstream.h
+++ b/toonz/sources/include/tstream.h
@@ -238,7 +238,7 @@ public:
 
 private:
 	// Not copyable
-	TOStream(const TOStream &) = delete;			      //!< Not implemented
+	TOStream(const TOStream &) = default;			      //!< Not implemented
 	TOStream &operator=(const TOStream &) = delete; //!< Not implemented
 };