diff --git a/src/xrt/drivers/realsense/rs_6dof.c b/src/xrt/drivers/realsense/rs_6dof.c
index cbc678e2a..d19c70d8c 100644
--- a/src/xrt/drivers/realsense/rs_6dof.c
+++ b/src/xrt/drivers/realsense/rs_6dof.c
@@ -12,6 +12,7 @@
 #include "xrt/xrt_defines.h"
 #include "xrt/xrt_device.h"
 
+#include "util/u_time.h"
 #include "util/u_device.h"
 
 #include <librealsense2/rs.h>