diff --git a/NEWS b/NEWS
index 9701c15ed..c962cd4ff 100644
--- a/NEWS
+++ b/NEWS
@@ -60,6 +60,12 @@ New in spot 2.6.1.dev (not yet released)
     colors 0-7, and that higher color numbers cycle into this 16-color
     palette.
 
+  Bugs fixed:
+
+  - exclusive_ap::constrain() (called by autfilt --exclusive-ap=...)
+    would incorrectly copy the "universal" property of the input
+    automaton, causing print_hoa() to fail.
+
 New in spot 2.6.1  (2018-08-04)
 
   Command-line tools:
diff --git a/spot/tl/exclusive.cc b/spot/tl/exclusive.cc
index 979b8fe94..4d863eaf0 100644
--- a/spot/tl/exclusive.cc
+++ b/spot/tl/exclusive.cc
@@ -178,7 +178,7 @@ namespace spot
 
     twa_graph_ptr res = make_twa_graph(aut->get_dict());
     res->copy_ap_of(aut);
-    res->prop_copy(aut, { true, true, false, true, false, true });
+    res->prop_copy(aut, { true, true, false, false, false, true });
     res->copy_acceptance_of(aut);
     if (simplify_guards)
       {
diff --git a/tests/core/exclusive-tgba.test b/tests/core/exclusive-tgba.test
index 59e0093f0..9262546b7 100755
--- a/tests/core/exclusive-tgba.test
+++ b/tests/core/exclusive-tgba.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2015, 2016 Laboratoire de Recherche et Développement de
+# Copyright (C) 2015, 2016, 2018 Laboratoire de Recherche et Développement de
 # l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -173,3 +173,9 @@ test "5,22,10" = `ltl2tgba -B -f 'F(Ga | (GFb <-> GFc))' |
 ltl2tgba -B -f 'F(Ga | (GFb <-> GFc))' |
   autfilt --small --exclusive-ap=a,b,c --simplify-ex --ap=3 > out
 test "5,21,10" = `autfilt out --stats='%s,%t,%e' --ap=2`
+
+
+# Issue #363.
+ltl2tgba 'a U b' |
+  autfilt --exclusive-ap=a,b,c --simplify-exclusive-ap > out
+test "2,8,3" = `autfilt out --stats='%s,%t,%e' --ap=2`