1 files changed, 5 insertions, 0 deletions
diff --git a/src/cpl.h b/src/cpl.h
index 316a5504..8d7c76e4 100644
--- a/src/cpl.h
+++ b/src/cpl.h
@@ -54,6 +54,9 @@
 #include <vector>
 
 
+struct verify_invalid_sound_reel_and_additional_language;
+
+
 namespace dcp {
 
 
@@ -280,6 +283,8 @@ protected:
 	std::string pkl_type (Standard standard) const;
 
 private:
+	friend struct ::verify_invalid_sound_reel_and_additional_language;
+
 	void maybe_write_composition_metadata_asset (xmlpp::Element* node) const;
 	void read_composition_metadata_asset (cxml::ConstNodePtr node);