diff -ur astropy-0.3.2/astropy/coordinates/angle_utilities.py astropy-0.3.2.ply/astropy/coordinates/angle_utilities.py
--- astropy-0.3.2/astropy/coordinates/angle_utilities.py	2014-05-22 11:59:59.700577989 +0200
+++ astropy-0.3.2.ply/astropy/coordinates/angle_utilities.py	2014-05-22 12:01:18.907194201 +0200
@@ -51,7 +51,7 @@
 
     @classmethod
     def _make_parser(cls):
-        from ..extern.ply import lex, yacc
+        from ply import lex, yacc
 
         # List of token names.
         tokens = (
diff -ur astropy-0.3.2/astropy/units/format/cds.py astropy-0.3.2.ply/astropy/units/format/cds.py
--- astropy-0.3.2/astropy/units/format/cds.py	2014-05-22 11:59:59.814578873 +0200
+++ astropy-0.3.2.ply/astropy/units/format/cds.py	2014-05-22 12:01:32.922303728 +0200
@@ -63,7 +63,7 @@
         YACC grammar in the `unity library
         <https://bitbucket.org/nxg/unity/>`_.
         """
-        from ...extern.ply import lex, yacc
+        from ply import lex, yacc
 
         tokens = (
             'PRODUCT',
diff -ur astropy-0.3.2/astropy/units/format/generic.py astropy-0.3.2.ply/astropy/units/format/generic.py
--- astropy-0.3.2/astropy/units/format/generic.py	2014-05-22 11:59:59.817578896 +0200
+++ astropy-0.3.2.ply/astropy/units/format/generic.py	2014-05-22 12:01:48.698427183 +0200
@@ -48,7 +48,7 @@
         formats, the only difference being the set of available unit
         strings.
         """
-        from ...extern.ply import lex, yacc
+        from ply import lex, yacc
 
         tokens = (
             'DOUBLE_STAR',