diff --git a/source/blender/editors/io/io_usd.c b/source/blender/editors/io/io_usd.c
index c4f1ae88d28..cf28c88edf0 100644
--- a/source/blender/editors/io/io_usd.c
+++ b/source/blender/editors/io/io_usd.c
@@ -201,6 +201,8 @@ void WM_OT_usd_export(struct wmOperatorType *ot)
   ot->poll = WM_operator_winactive;
   ot->ui = wm_usd_export_draw;
 
+  ot->flag = OPTYPE_REGISTER; /* No UNDO possible. */
+
   WM_operator_properties_filesel(ot,
                                  FILE_TYPE_FOLDER | FILE_TYPE_USD,
                                  FILE_BLENDER,
@@ -459,6 +461,8 @@ void WM_OT_usd_import(struct wmOperatorType *ot)
   ot->poll = WM_operator_winactive;
   ot->ui = wm_usd_import_draw;
 
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
   WM_operator_properties_filesel(ot,
                                  FILE_TYPE_FOLDER | FILE_TYPE_USD,
                                  FILE_BLENDER,