diff --git a/src/xrt/auxiliary/util/u_pretty_print.h b/src/xrt/auxiliary/util/u_pretty_print.h
index 343aef2ad..ebfc1ffc0 100644
--- a/src/xrt/auxiliary/util/u_pretty_print.h
+++ b/src/xrt/auxiliary/util/u_pretty_print.h
@@ -6,6 +6,7 @@
  * @author Jakob Bornecrantz <jakob@collabora.com>
  * @ingroup aux_pretty
  */
+#pragma once
 
 #include "xrt/xrt_defines.h"