diff --git a/jedi/evaluate/finder.py b/jedi/evaluate/finder.py
index d98fab64..62ac05ab 100644
--- a/jedi/evaluate/finder.py
+++ b/jedi/evaluate/finder.py
@@ -26,7 +26,6 @@ from jedi.evaluate import docstrings
 from jedi.evaluate import iterable
 from jedi.evaluate import imports
 from jedi.evaluate import analysis
-from jedi.evaluate import precedence
 from jedi.evaluate import flow_analysis
 
 
@@ -158,23 +157,6 @@ class NameFinder(object):
         if isinstance(scope, pr.Flow) \
                 or isinstance(scope, pr.KeywordStatement) and scope.name == 'global':
 
-            # Check for `if foo is not None`, because Jedi is not interested in
-            # None values, so this is the only branch we actually care about.
-            # ATM it carries the same issue as the isinstance checks. It
-            # doesn't work with instance variables (self.foo).
-            if isinstance(scope, pr.Flow) and scope.command in ('if', 'while'):
-                try:
-                    expression_list = scope.inputs[0].expression_list()
-                except IndexError:
-                    pass
-                else:
-                    p = precedence.create_precedence(expression_list)
-                    if (isinstance(p, precedence.Precedence)
-                            and p.operator.string == 'is not'
-                            and p.right.get_code() == 'None'
-                            and p.left.get_code() == unicode(self.name_str)):
-                        return True
-
             if isinstance(name_list_scope, er.Class):
                 name_list_scope = name_list_scope.base
             return scope == name_list_scope
diff --git a/test/completion/basic.py b/test/completion/basic.py
index 65aa4c9c..adce3617 100644
--- a/test/completion/basic.py
+++ b/test/completion/basic.py
@@ -356,16 +356,6 @@ foo = \
 #? int()
 foo
 
-# -----------------
-# if `is not` checks
-# -----------------
-
-foo = ['a']
-if foo is not None:
-    foo = ''.join(foo)
-#? str()
-foo
-
 # -----------------
 # module attributes
 # -----------------