diff --git a/parso/python/normalizer.py b/parso/python/normalizer.py
index 1fa08ba..b128be2 100644
--- a/parso/python/normalizer.py
+++ b/parso/python/normalizer.py
@@ -5,6 +5,7 @@ import re
 from contextlib import contextmanager
 
 from parso.normalizer import Normalizer, NormalizerConfig, Issue
+from parso.python.tree import search_ancestor
 
 _BLOCK_STMTS = ('if_stmt', 'while_stmt', 'for_stmt', 'try_stmt', 'with_stmt')
 _STAR_EXPR_PARENTS = ('testlist_star_expr', 'testlist_comp', 'exprlist')
@@ -260,7 +261,6 @@ class ErrorFinder(Normalizer):
         self._version = self._grammar.version_info
 
     def initialize(self, node):
-        from parso.python.tree import search_ancestor
         allowed = 'classdef', 'funcdef', 'file_input'
         if node.type in allowed:
             parent_scope = node
@@ -380,7 +380,6 @@ class ErrorFinder(Normalizer):
                     message = "iterable unpacking cannot be used in comprehension"
                     self._add_syntax_error(message, node)
             if self._version <= (3, 4):
-                from parso.python.tree import search_ancestor
                 n = search_ancestor(node, 'for_stmt', 'expr_stmt')
                 found_definition = False
                 if n is not None:
diff --git a/parso/python/pep8.py b/parso/python/pep8.py
index a3ebed4..a22647c 100644
--- a/parso/python/pep8.py
+++ b/parso/python/pep8.py
@@ -3,6 +3,7 @@ from contextlib import contextmanager
 
 from parso.python.normalizer import ErrorFinder, ErrorFinderConfig
 from parso.normalizer import Rule
+from parso.python.tree import search_ancestor, Flow, Scope
 
 
 _IMPORT_TYPES = ('import_name', 'import_from')
@@ -122,7 +123,6 @@ class BackslashNode(IndentationNode):
     type = IndentationTypes.BACKSLASH
 
     def __init__(self, config, parent_indentation, containing_leaf, spacing, parent=None):
-        from parso.python.tree import search_ancestor
         expr_stmt = search_ancestor(containing_leaf, 'expr_stmt')
         if expr_stmt is not None:
             equals = expr_stmt.children[-2]
@@ -224,7 +224,6 @@ class PEP8Normalizer(ErrorFinder):
             #if module.type == 'simple_stmt':
             if module.type == 'file_input':
                 index = module.children.index(simple_stmt)
-                from parso.python.tree import Flow
                 for child in module.children[:index]:
                     children = [child]
                     if child.type == 'simple_stmt':
@@ -641,7 +640,6 @@ class PEP8Normalizer(ErrorFinder):
                 else:
                     self.add_issuadd_issue(741, message % 'variables', leaf)
         elif leaf.value == ':':
-            from parso.python.tree import Flow, Scope
             if isinstance(leaf.parent, (Flow, Scope)) and leaf.parent.type != 'lambdef':
                 next_leaf = leaf.get_next_leaf()
                 if next_leaf.type != 'newline':
@@ -687,7 +685,6 @@ class PEP8Normalizer(ErrorFinder):
                 self.add_issue(391, 'Blank line at end of file', leaf)
 
     def add_issue(self, code, message, node):
-        from parso.python.tree import search_ancestor
         if self._previous_leaf is not None:
             if search_ancestor(self._previous_leaf, 'error_node') is not None:
                 return