diff -r 3c837f8c8ed5 -r 5db014c36f42 src/Pure/Isar/outer_syntax.ML
--- a/src/Pure/Isar/outer_syntax.ML	Wed Apr 19 23:27:55 2023 +0200
+++ b/src/Pure/Isar/outer_syntax.ML	Thu Apr 20 11:57:34 2023 +0200
@@ -112,7 +112,7 @@
 (* maintain commands *)
 
 fun add_command name cmd thy =
-  if member (op =) Thy_Header.bootstrap_thys (Context.theory_name thy) then thy
+  if member (op =) Thy_Header.bootstrap_thys (Context.theory_base_name thy) then thy
   else
     let
       val _ =