diff --git a/src/xrt/auxiliary/bindings/bindings.json b/src/xrt/auxiliary/bindings/bindings.json
index a818d049f..4e1dccc48 100644
--- a/src/xrt/auxiliary/bindings/bindings.json
+++ b/src/xrt/auxiliary/bindings/bindings.json
@@ -3747,6 +3747,7 @@
 			"title": "Blubur S1",
 			"type": "tracked_hmd",
 			"monado_device": "XRT_DEVICE_BLUBUR_S1",
+			"extension": "MNDX_blubur_s1",
 			"extended_by": [],
 			"subaction_paths": [
 				"/user/head"
diff --git a/src/xrt/drivers/blubur_s1/blubur_s1_hmd.c b/src/xrt/drivers/blubur_s1/blubur_s1_hmd.c
index c3b903731..0db776545 100644
--- a/src/xrt/drivers/blubur_s1/blubur_s1_hmd.c
+++ b/src/xrt/drivers/blubur_s1/blubur_s1_hmd.c
@@ -502,12 +502,12 @@ blubur_s1_hmd_thread(void *ptr)
 	return NULL;
 }
 
-static struct xrt_binding_input_pair vive_pro_inputs_blubur_s1_hmd[1] = {
+static struct xrt_binding_input_pair vive_pro_inputs_blubur_s1_hmd[] = {
     {XRT_INPUT_VIVEPRO_SYSTEM_CLICK, XRT_INPUT_BLUBUR_S1_MENU_CLICK},
 };
 
 // Exported to drivers.
-static struct xrt_binding_profile blubur_s1_hmd_binding_profiles[2] = {
+static struct xrt_binding_profile blubur_s1_hmd_binding_profiles[] = {
     {
         .name = XRT_DEVICE_VIVE_PRO,
         .inputs = vive_pro_inputs_blubur_s1_hmd,