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-rw-r--r--src/sound_frame.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/sound_frame.h b/src/sound_frame.h
index 83846fc8..ad4f9604 100644
--- a/src/sound_frame.h
+++ b/src/sound_frame.h
@@ -17,6 +17,9 @@
*/
+#ifndef LIBDCP_SOUND_FRAME_H
+#define LIBDCP_SOUND_FRAME_H
+
#include <string>
#include <stdint.h>
@@ -42,3 +45,5 @@ private:
};
}
+
+#endif