diff --git a/src/xrt/drivers/simulated/simulated_hmd.c b/src/xrt/drivers/simulated/simulated_hmd.c
index 34223cd4f..b0b7dc0ce 100644
--- a/src/xrt/drivers/simulated/simulated_hmd.c
+++ b/src/xrt/drivers/simulated/simulated_hmd.c
@@ -14,14 +14,14 @@
 #include "math/m_api.h"
 #include "math/m_mathinclude.h"
 
-#include "util/u_var.h"
-#include "util/u_misc.h"
-#include "util/u_time.h"
 #include "util/u_debug.h"
 #include "util/u_device.h"
-#include "util/u_logging.h"
-#include "util/u_pretty_print.h"
 #include "util/u_distortion_mesh.h"
+#include "util/u_logging.h"
+#include "util/u_misc.h"
+#include "util/u_pretty_print.h"
+#include "util/u_time.h"
+#include "util/u_var.h"
 
 #include "simulated_interface.h"
 
@@ -174,7 +174,6 @@ simulated_ref_space_usage(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-
 /*
  *
  * 'Exported' functions.
@@ -196,6 +195,7 @@ simulated_hmd_create(enum simulated_movement movement, const struct xrt_pose *ce
 	hmd->base.update_inputs = u_device_noop_update_inputs;
 	hmd->base.get_tracked_pose = simulated_hmd_get_tracked_pose;
 	hmd->base.get_view_poses = u_device_get_view_poses;
+	hmd->base.get_visibility_mask = u_device_get_visibility_mask;
 	hmd->base.ref_space_usage = simulated_ref_space_usage;
 	hmd->base.destroy = simulated_hmd_destroy;
 	hmd->base.name = XRT_DEVICE_GENERIC_HMD;