1 files changed, 5 insertions, 0 deletions
diff --git a/src/lib/state.h b/src/lib/state.h
index b60c66673..251124a43 100644
--- a/src/lib/state.h
+++ b/src/lib/state.h
@@ -18,6 +18,9 @@
 
 */
 
+#ifndef DCPOMATIC_STATE_H
+#define DCPOMATIC_STATE_H
+
 #include <boost/noncopyable.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/optional.hpp>
@@ -35,3 +38,5 @@ public:
 protected:
 	static boost::filesystem::path path (std::string file, bool create_directories = true);
 };
+
+#endif