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},
 )