1 files changed, 3 insertions, 0 deletions
diff --git a/src/lib/reel_writer.h b/src/lib/reel_writer.h
index fff2e0b9e..b96bcfc68 100644
--- a/src/lib/reel_writer.h
+++ b/src/lib/reel_writer.h
@@ -33,6 +33,7 @@ namespace dcpomatic {
 class Film;
 class Job;
 class AudioBuffers;
+struct write_frame_info_test;
 
 namespace dcp {
 	class MonoPictureAsset;
@@ -92,6 +93,8 @@ public:
 
 private:
 
+	friend struct ::write_frame_info_test;
+
 	void write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const;
 	long frame_info_position (Frame frame, Eyes eyes) const;
 	Frame check_existing_picture_asset ();