1 files changed, 2 insertions, 1 deletions
diff --git a/src/lib/ratio.h b/src/lib/ratio.h
index 5480eee12..c331edabe 100644
--- a/src/lib/ratio.h
+++ b/src/lib/ratio.h
@@ -21,9 +21,10 @@
 #define DCPOMATIC_RATIO_H
 
 #include <vector>
+#include <boost/utility.hpp>
 #include <libdcp/util.h>
 
-class Ratio
+class Ratio : public boost::noncopyable
 {
 public:
 	Ratio (float ratio, std::string id, std::string n, std::string d)