1 files changed, 3 insertions, 0 deletions
diff --git a/src/lib/content.h b/src/lib/content.h
index 5b804b331..ce6eaa83b 100644
--- a/src/lib/content.h
+++ b/src/lib/content.h
@@ -50,6 +50,9 @@ namespace cxml {
 class Job;
 class Film;
 class AtmosContent;
+class AudioContent;
+class TextContent;
+class VideoContent;
 
 class ContentProperty
 {