diff --git a/src/engine/SCons/EnvironmentTests.py b/src/engine/SCons/EnvironmentTests.py
index 298693eb53..d8c4f2f4aa 100644
--- a/src/engine/SCons/EnvironmentTests.py
+++ b/src/engine/SCons/EnvironmentTests.py
@@ -1751,7 +1751,7 @@ class TestA(object):
         env2.Dictionary()['ZZZ'][5] = 6
         assert env1.Dictionary()['XXX'] == env2.Dictionary()['XXX']
         assert 4 in env2.Dictionary()['YYY']
-        assert not 4 in env1.Dictionary()['YYY']
+        assert 4 not in env1.Dictionary()['YYY']
         assert 5 in env2.Dictionary()['ZZZ']
         assert 5 not in env1.Dictionary()['ZZZ']
 
diff --git a/test/LEX/live_mingw.py b/test/LEX/live_mingw.py
index 13e23429b7..b1a8ea9b71 100644
--- a/test/LEX/live_mingw.py
+++ b/test/LEX/live_mingw.py
@@ -53,7 +53,7 @@
 test.write('SConstruct', """
 foo = Environment(tools=['default', 'mingw', 'lex'], LEXUNISTD="")
 lex = foo.Dictionary('LEX')
-bar = Environment(LEX = r'%(_python_)s wrapper.py ' + lex,
+bar = Environment(LEX=r'%(_python_)s wrapper.py ' + lex['LEX'],
                   LEXFLAGS = '-b',
                   LEXUNISTD="",
                   tools=['default', 'mingw', 'lex'])
diff --git a/test/LEX/no_lex.py b/test/LEX/no_lex.py
index 89ffdc70b3..cea98b5b08 100644
--- a/test/LEX/no_lex.py
+++ b/test/LEX/no_lex.py
@@ -48,7 +48,7 @@ def Detect(self, progs):
 print(foo.Dictionary('LEX'))
 """ % locals())
 
-test.run(arguments = '-Q -s', stdout = 'None\n' )
+test.run(arguments = '-Q -s', stdout = "{'LEX': None\n" )
 
 test.pass_test()