1 files changed, 1 insertions, 3 deletions
diff --git a/src/cpl.h b/src/cpl.h
index c1489a2c..78e46c6a 100644
--- a/src/cpl.h
+++ b/src/cpl.h
@@ -307,9 +307,7 @@ public:
 		return _main_picture_active_area;
 	}
 
-	void set_main_picture_active_area (dcp::Size s) {
-		_main_picture_active_area = s;
-	}
+	void set_main_picture_active_area(dcp::Size area);
 
 	std::vector<std::string> additional_subtitle_languages () const {
 		return _additional_subtitle_languages;