1 files changed, 5 insertions, 0 deletions
diff --git a/src/cpl.h b/src/cpl.h
index c91e256a..2b37257d 100644
--- a/src/cpl.h
+++ b/src/cpl.h
@@ -17,6 +17,9 @@
 
 */
 
+#ifndef LIBDCP_CPL_H
+#define LIBDCP_CPL_H
+
 #include <list>
 #include <boost/shared_ptr.hpp>
 #include <boost/function.hpp>
@@ -121,3 +124,5 @@ private:
 };
 
 }
+
+#endif