diff --git a/library/include/mobilisis/time_range.h b/library/include/mobilisis/time_range.h
index 54272ad..5abd9c1 100644
--- a/library/include/mobilisis/time_range.h
+++ b/library/include/mobilisis/time_range.h
@@ -1,8 +1,12 @@
-#pragma once
+#ifndef TIME_RANGE_H_INCLUDED
+#define TIME_RANGE_H_INCLUDED
+
 #include "time_range_header.h"
 
 struct TimeRange {
 public:
 	bool IsActive;
 	ATBTimeRange TimeRangeStructure;
-};
\ No newline at end of file
+};
+
+#endif // TIME_RANGE_H_INCLUDED