Try to fix compile warning on OS X.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/object.h b/src/object.h
index 8364efff..50817051 100644
--- a/src/object.h
+++ b/src/object.h
@@ -64,10 +64,10 @@ public:
 	}
 
 protected:
-	friend class ::write_interop_subtitle_test;
-	friend class ::write_interop_subtitle_test2;
-	friend class ::write_smpte_subtitle_test;
-	friend class ::write_smpte_subtitle_test2;
+	friend struct ::write_interop_subtitle_test;
+	friend struct ::write_interop_subtitle_test2;
+	friend struct ::write_smpte_subtitle_test;
+	friend struct ::write_smpte_subtitle_test2;
 
 	/** ID */
 	std::string _id;