diff --git a/toolz/functoolz.py b/toolz/functoolz.py
index 21a7d3be..c568aae8 100644
--- a/toolz/functoolz.py
+++ b/toolz/functoolz.py
@@ -1,12 +1,11 @@
 from functools import reduce, partial
 import inspect
-import operator
-from operator import attrgetter
+import sys
+from operator import attrgetter, not_
 from importlib import import_module
 from textwrap import dedent
 from types import MethodType
 
-from .compatibility import PYPY
 from .utils import no_default
 
 
@@ -14,6 +13,8 @@
            'compose', 'compose_left', 'pipe', 'complement', 'juxt', 'do',
            'curry', 'flip', 'excepts')
 
+PYPY = hasattr(sys, 'pypy_version_info')
+
 
 def identity(x):
     """ Identity function. Return x
@@ -640,7 +641,7 @@ def complement(func):
     >>> isodd(2)
     False
     """
-    return compose(operator.not_, func)
+    return compose(not_, func)
 
 
 class juxt(object):