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-rw-r--r--src/subtitle_string.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/subtitle_string.h b/src/subtitle_string.h
index 59131f07..076a6ec7 100644
--- a/src/subtitle_string.h
+++ b/src/subtitle_string.h
@@ -17,6 +17,9 @@
*/
+#ifndef LIBDCP_SUBTITLE_STRING_H
+#define LIBDCP_SUBTITLE_STRING_H
+
#include "types.h"
#include "dcp_time.h"
#include <string>
@@ -122,3 +125,5 @@ bool operator== (SubtitleString const & a, SubtitleString const & b);
std::ostream& operator<< (std::ostream& s, SubtitleString const & sub);
}
+
+#endif