diff -r bb4e4c253ebe -r a2c042364efc src/Pure/Tools/dump.scala
--- a/src/Pure/Tools/dump.scala	Tue Sep 18 11:14:30 2018 +0200
+++ b/src/Pure/Tools/dump.scala	Tue Sep 18 23:07:34 2018 +0200
@@ -112,7 +112,7 @@
     val include_sessions =
       deps.sessions_structure.imports_topological_order
 
-    val use_theories = deps.used_theories_conditions(progress.echo_warning)
+    val use_theories = deps.used_theories_condition(progress.echo_warning).map(_.theory)
 
 
     /* dump aspects asynchronously */