diff --git a/pycparser/c_lexer.py b/pycparser/c_lexer.py

index 045d24e..9b3cbf2 100644

--- a/pycparser/c_lexer.py

+++ b/pycparser/c_lexer.py

@@ -9,8 +9,8 @@

 import re

 import sys

-from .ply import lex

-from .ply.lex import TOKEN

+from ply import lex

+from ply.lex import TOKEN

 class CLexer(object):

diff --git a/pycparser/c_parser.py b/pycparser/c_parser.py

index 744ede8..50156a3 100644

--- a/pycparser/c_parser.py

+++ b/pycparser/c_parser.py

@@ -8,7 +8,7 @@

 #------------------------------------------------------------------------------

 import re

-from .ply import yacc

+from ply import yacc

 from . import c_ast

 from .c_lexer import CLexer

diff --git a/setup.py b/setup.py

index 6dce89c..b3dbfb4 100644

--- a/setup.py

+++ b/setup.py

@@ -8,6 +8,8 @@ except ImportError:

     from distutils.command.install import install as _install

     from distutils.command.sdist import sdist as _sdist

+import ply

+

 def _run_build_tables(dir):

     from subprocess import check_call

@@ -60,7 +62,8 @@ setup(

         'Programming Language :: Python :: 3.6',

     ],

     python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",

-    packages=['pycparser', 'pycparser.ply'],

+    packages=['pycparser'],

+    install_requires=['ply==' + ply.__version__],

     package_data={'pycparser': ['*.cfg']},

     cmdclass={'install': install, 'sdist': sdist},

 )