diff --git a/python/Makefile.am b/python/Makefile.am
index 8addbaa7c..c66706668 100644
--- a/python/Makefile.am
+++ b/python/Makefile.am
@@ -1,5 +1,5 @@
 ## -*- coding: utf-8 -*-
-## Copyright (C) 2010, 2011, 2013-2018 Laboratoire de Recherche
+## Copyright (C) 2010, 2011, 2013-2019 Laboratoire de Recherche
 ## et Development de l'Epita (LRDE).
 ## Copyright (C) 2003, 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
 ## département Systèmes Répartis Coopératifs (SRC), Université Pierre
@@ -25,12 +25,7 @@ AUTOMAKE_OPTIONS = subdir-objects
 AM_CPPFLAGS = -I$(PYTHONINC) -I$(top_builddir) -I$(top_srcdir) \
 	      $(BUDDY_CPPFLAGS) -DSWIG_TYPE_TABLE=spot
 
-# Disable fastproxy, because IPython 2 bogusly ignores _repr_latex_
-# when -fastproxy is used.
-#   https://github.com/ipython/ipython/issues/7003
-# Once a fixed version of IPython hits Debian stable, we can remove
-# this.
-SWIGFLAGS = -c++ -python -py3 -O -nofastproxy -MD
+SWIGFLAGS = -c++ -python -py3 -O -MD
 
 EXTRA_DIST = buddy.i spot/impl.i spot/ltsmin.i spot/gen.i
 nobase_pyexec_PYTHON = \
diff --git a/python/spot/__init__.py b/python/spot/__init__.py
index dc7b9efbc..acae23331 100644
--- a/python/spot/__init__.py
+++ b/python/spot/__init__.py
@@ -1074,7 +1074,7 @@ def bdd_to_formula(b, dic=_bdd_dict):
 def language_containment_checker(dic=_bdd_dict):
     from spot.impl import language_containment_checker as c
     c.contains = lambda this, a, b: c.contained(this, b, a)
-    c.are_equivalent = c.equal
+    c.are_equivalent = lambda this, a, b: c.equal(this, a, b)
     return c(dic)
 
 def mp_hierarchy_svg(cl=None):