diff --git a/src/pip/_internal/index/package_finder.py b/src/pip/_internal/index/package_finder.py
index 897444aae..9b338e693 100644
--- a/src/pip/_internal/index/package_finder.py
+++ b/src/pip/_internal/index/package_finder.py
@@ -38,7 +38,7 @@ if MYPY_CHECK_RUNNING:
         FrozenSet, Iterable, List, Optional, Set, Text, Tuple, Union,
     )
     from pip._vendor.packaging.version import _BaseVersion
-    from pip._internal.collector import LinkCollector
+    from pip._internal.index.collector import LinkCollector
     from pip._internal.models.search_scope import SearchScope
     from pip._internal.req import InstallRequirement
     from pip._internal.pep425tags import Pep425Tag
diff --git a/src/pip/_internal/models/link.py b/src/pip/_internal/models/link.py
index 2d50d1798..ff808f5e9 100644
--- a/src/pip/_internal/models/link.py
+++ b/src/pip/_internal/models/link.py
@@ -19,7 +19,7 @@ from pip._internal.utils.urls import path_to_url, url_to_path
 
 if MYPY_CHECK_RUNNING:
     from typing import Optional, Text, Tuple, Union
-    from pip._internal.collector import HTMLPage
+    from pip._internal.index.collector import HTMLPage
     from pip._internal.utils.hashes import Hashes
 
 
diff --git a/src/pip/_internal/self_outdated_check.py b/src/pip/_internal/self_outdated_check.py
index c85fcc635..38f1d815f 100644
--- a/src/pip/_internal/self_outdated_check.py
+++ b/src/pip/_internal/self_outdated_check.py
@@ -14,7 +14,7 @@ from pip._vendor import pkg_resources
 from pip._vendor.packaging import version as packaging_version
 from pip._vendor.six import ensure_binary
 
-from pip._internal.collector import LinkCollector
+from pip._internal.index.collector import LinkCollector
 from pip._internal.index.package_finder import PackageFinder
 from pip._internal.models.search_scope import SearchScope
 from pip._internal.models.selection_prefs import SelectionPreferences
diff --git a/tests/unit/test_build_env.py b/tests/unit/test_build_env.py
index 372c83556..9db08a124 100644
--- a/tests/unit/test_build_env.py
+++ b/tests/unit/test_build_env.py
@@ -22,7 +22,7 @@ def run_with_build_env(script, setup_script_contents,
             import sys
 
             from pip._internal.build_env import BuildEnvironment
-            from pip._internal.collector import LinkCollector
+            from pip._internal.index.collector import LinkCollector
             from pip._internal.index.package_finder import PackageFinder
             from pip._internal.models.search_scope import SearchScope
             from pip._internal.models.selection_prefs import (
diff --git a/tests/unit/test_collector.py b/tests/unit/test_collector.py
index f602c956a..cf709c99b 100644
--- a/tests/unit/test_collector.py
+++ b/tests/unit/test_collector.py
@@ -9,7 +9,7 @@ from mock import Mock, patch
 from pip._vendor import html5lib, requests
 from pip._vendor.six.moves.urllib import request as urllib_request
 
-from pip._internal.collector import (
+from pip._internal.index.collector import (
     HTMLPage,
     _clean_link,
     _determine_base_url,
@@ -334,7 +334,7 @@ def test_get_html_page_invalid_scheme(caplog, url, vcs_scheme):
     assert page is None
     assert caplog.record_tuples == [
         (
-            "pip._internal.collector",
+            "pip._internal.index.collector",
             logging.DEBUG,
             "Cannot look at {} URL {}".format(vcs_scheme, url),
         ),
@@ -367,7 +367,8 @@ def test_get_html_page_directory_append_index(tmpdir):
 
     session = mock.Mock(PipSession)
     fake_response = make_fake_html_response(expected_url)
-    with mock.patch("pip._internal.collector._get_html_response") as mock_func:
+    mock_func = mock.patch("pip._internal.index.collector._get_html_response")
+    with mock_func as mock_func:
         mock_func.return_value = fake_response
         actual = _get_html_page(Link(dir_url), session=session)
         assert mock_func.mock_calls == [
@@ -434,7 +435,7 @@ def check_links_include(links, names):
 
 class TestLinkCollector(object):
 
-    @patch('pip._internal.collector._get_html_response')
+    @patch('pip._internal.index.collector._get_html_response')
     def test_collect_links(self, mock_get_html_response, caplog, data):
         caplog.set_level(logging.DEBUG)
 
@@ -474,5 +475,5 @@ class TestLinkCollector(object):
         1 location(s) to search for versions of twine:
         * https://pypi.org/simple/twine/""")
         assert caplog.record_tuples == [
-            ('pip._internal.collector', logging.DEBUG, expected_message),
+            ('pip._internal.index.collector', logging.DEBUG, expected_message),
         ]
diff --git a/tests/unit/test_finder.py b/tests/unit/test_finder.py
index ac17cdf9d..e7bf13e02 100644
--- a/tests/unit/test_finder.py
+++ b/tests/unit/test_finder.py
@@ -62,7 +62,10 @@ def test_no_partial_name_match(data):
 
 def test_tilde():
     """Finder can accept a path with ~ in it and will normalize it."""
-    with patch('pip._internal.collector.os.path.exists', return_value=True):
+    patched_exists = patch(
+        'pip._internal.index.collector.os.path.exists', return_value=True
+    )
+    with patched_exists:
         finder = make_test_finder(find_links=['~/python-pkgs'])
     req = install_req_from_line("gmpy")
     with pytest.raises(DistributionNotFound):
diff --git a/tests/unit/test_index.py b/tests/unit/test_index.py
index fc3fa0c15..bc86398ee 100644
--- a/tests/unit/test_index.py
+++ b/tests/unit/test_index.py
@@ -3,7 +3,7 @@ import logging
 import pytest
 from pip._vendor.packaging.specifiers import SpecifierSet
 
-from pip._internal.collector import LinkCollector
+from pip._internal.index.collector import LinkCollector
 from pip._internal.index.package_finder import (
     CandidateEvaluator,
     CandidatePreferences,