diff --git a/src/xrt/include/xrt/xrt_openxr_includes.h b/src/xrt/include/xrt/xrt_openxr_includes.h
index 9ab416bc6..8db5dcfa8 100644
--- a/src/xrt/include/xrt/xrt_openxr_includes.h
+++ b/src/xrt/include/xrt/xrt_openxr_includes.h
@@ -33,6 +33,7 @@ typedef void *GLXContext;
 typedef void *EGLDisplay;
 typedef void *EGLContext;
 typedef void *EGLConfig;
+typedef unsigned int EGLenum;
 typedef void (*__eglMustCastToProperFunctionPointerType)(void);
 typedef __eglMustCastToProperFunctionPointerType (*PFNEGLGETPROCADDRESSPROC)(const char *procname);
 #endif