diff --git a/src/external/openxr_includes/openxr/XR_MNDX_xdev_space.h b/src/external/openxr_includes/openxr/XR_MNDX_xdev_space.h
new file mode 100644
index 000000000..fcfd962b5
--- /dev/null
+++ b/src/external/openxr_includes/openxr/XR_MNDX_xdev_space.h
@@ -0,0 +1,80 @@
+// Copyright 2023-2024, Collabora, Ltd.
+// SPDX-License-Identifier: BSL-1.0
+/*!
+ * @file
+ * @brief  Preview header for XR_MNDX_xdev_space extension.
+ * @author Jakob Bornecrantz <jakob@collabora.com>
+ * @ingroup external_openxr
+ */
+#ifndef XR_MNDX_XDEV_SPACE_H
+#define XR_MNDX_XDEV_SPACE_H 1
+
+#include "openxr_extension_helpers.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Extension number 445 (444 prefix)
+#define XR_MNDX_xdev_space 1
+#define XR_MNDX_xdev_space_SPEC_VERSION 1
+#define XR_MNDX_XDEV_SPACE_EXTENSION_NAME "XR_MNDX_xdev_space"
+
+
+XR_DEFINE_ATOM(XrXDevIdMNDX)
+XR_DEFINE_HANDLE(XrXDevListMNDX)
+
+
+XR_STRUCT_ENUM(XR_TYPE_SYSTEM_XDEV_SPACE_PROPERTIES_MNDX, 1000444001);
+// XrSystemXDevSpacePropertiesMNDX extends XrSystemProperties
+typedef struct XrSystemXDevSpacePropertiesMNDX {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    XrBool32              supportsXDevSpace;
+} XrSystemXDevSpacePropertiesMNDX;
+
+XR_STRUCT_ENUM(XR_TYPE_CREATE_XDEV_LIST_INFO_MNDX, 1000444002);
+typedef struct XrCreateXDevListInfoMNDX {
+    XrStructureType             type;
+    const void* XR_MAY_ALIAS    next;
+} XrCreateXDevListInfoMNDX;
+
+XR_STRUCT_ENUM(XR_TYPE_GET_XDEV_INFO_MNDX, 1000444003);
+typedef struct XrGetXDevInfoMNDX {
+    XrStructureType             type;
+    const void* XR_MAY_ALIAS    next;
+    XrXDevIdMNDX                id;
+} XrGetXDevInfoMNDX;
+
+XR_STRUCT_ENUM(XR_TYPE_XDEV_PROPERTIES_MNDX, 1000444004);
+typedef struct XrXDevPropertiesMNDX {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    char                  name[256];
+    char                  serial[256];
+    XrBool32              canCreateSpace;
+} XrXDevPropertiesMNDX;
+
+XR_STRUCT_ENUM(XR_TYPE_CREATE_XDEV_SPACE_INFO_MNDX, 1000444005);
+typedef struct XrCreateXDevSpaceInfoMNDX {
+    XrStructureType             type;
+    const void* XR_MAY_ALIAS    next;
+    XrXDevListMNDX              xdevList;
+    XrXDevIdMNDX                id;
+    XrPosef                     offset;
+} XrCreateXDevSpaceInfoMNDX;
+
+
+typedef XrResult (XRAPI_PTR *PFN_xrCreateXDevListMNDX)(XrSession session, const XrCreateXDevListInfoMNDX *info, XrXDevListMNDX *xdevList);
+typedef XrResult (XRAPI_PTR *PFN_xrGetXDevListGenerationNumberMNDX)(XrXDevListMNDX xdevList, uint64_t *outGeneration);
+typedef XrResult (XRAPI_PTR *PFN_xrEnumerateXDevsMNDX)(XrXDevListMNDX xdevList, uint32_t xdevCapacityInput, uint32_t* xdevCountOutput, XrXDevIdMNDX* xdevs);
+typedef XrResult (XRAPI_PTR *PFN_xrGetXDevPropertiesMNDX)(XrXDevListMNDX xdevList, const XrGetXDevInfoMNDX *info, XrXDevPropertiesMNDX *properties);
+typedef XrResult (XRAPI_PTR *PFN_xrDestroyXDevListMNDX)(XrXDevListMNDX xdevList);
+typedef XrResult (XRAPI_PTR *PFN_xrCreateXDevSpaceMNDX)(XrSession session, const XrCreateXDevSpaceInfoMNDX *createInfo, XrSpace *space);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/external/openxr_includes/openxr/openxr_extension_helpers.h b/src/external/openxr_includes/openxr/openxr_extension_helpers.h
new file mode 100644
index 000000000..ccebf0582
--- /dev/null
+++ b/src/external/openxr_includes/openxr/openxr_extension_helpers.h
@@ -0,0 +1,18 @@
+/*
+** Copyright (c) 2017-2022, The Khronos Group Inc.
+**
+** SPDX-License-Identifier: Apache-2.0
+*/
+
+#pragma once
+
+#include <openxr/openxr.h>
+
+// These are just convenience macros for defining enums that would
+// normally be declared in the body of the enum, but can't be declared
+// that way easily for experimental extensions.
+
+#define XR_ENUM(type, enm, constant) static const type enm = (type)constant
+#define XR_STRUCT_ENUM(enm, constant) XR_ENUM(XrStructureType, enm, constant)
+#define XR_RESULT_ENUM(enm, constant) XR_ENUM(XrResult, enm, constant)
+#define XR_REFSPACE_ENUM(enm, constant) XR_ENUM(XrReferenceSpaceType, enm, constant)
diff --git a/src/xrt/include/xrt/xrt_openxr_includes.h b/src/xrt/include/xrt/xrt_openxr_includes.h
index 801e42053..bf93d2806 100644
--- a/src/xrt/include/xrt/xrt_openxr_includes.h
+++ b/src/xrt/include/xrt/xrt_openxr_includes.h
@@ -1,4 +1,4 @@
-// Copyright 2018-2023, Collabora, Ltd.
+// Copyright 2018-2024, Collabora, Ltd.
 // SPDX-License-Identifier: BSL-1.0
 /*!
  * @file
@@ -62,5 +62,6 @@ typedef __eglMustCastToProperFunctionPointerType (*PFNEGLGETPROCADDRESSPROC)(con
 #include "openxr/openxr_loader_negotiation.h" // IWYU pragma: export
 
 #include "openxr/XR_MNDX_hydra.h"
+#include "openxr/XR_MNDX_xdev_space.h"
 #include "openxr/XR_MNDX_system_buttons.h"
 #include "openxr/XR_MNDX_ball_on_a_stick_controller.h"