diff --git a/changelog/5180.removal.rst b/changelog/5180.removal.rst
index 112c0150f..1174a7cba 100644
--- a/changelog/5180.removal.rst
+++ b/changelog/5180.removal.rst
@@ -19,6 +19,8 @@ removed:
 
 * ``RemovedInPytest4Warning`` warning type.
 
+* ``request`` is now a reserved name for fixtures.
+
 
 For more information consult
 `Deprecations and Removals <https://docs.pytest.org/en/latest/deprecations.html>`__ in the docs.
diff --git a/src/_pytest/compat.py b/src/_pytest/compat.py
index d238061b4..6b750e16f 100644
--- a/src/_pytest/compat.py
+++ b/src/_pytest/compat.py
@@ -50,11 +50,11 @@ def iscoroutinefunction(func):
     )
 
 
-def getlocation(function, curdir):
+def getlocation(function, curdir=None):
     function = get_real_func(function)
     fn = py.path.local(inspect.getfile(function))
     lineno = function.__code__.co_firstlineno
-    if fn.relto(curdir):
+    if curdir is not None and fn.relto(curdir):
         fn = fn.relto(curdir)
     return "%s:%d" % (fn, lineno + 1)
 
diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index cf6ecd385..d7a20ad50 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -18,6 +18,7 @@ from pluggy import PluginManager
 
 import _pytest._code
 import _pytest.assertion
+import _pytest.deprecated
 import _pytest.hookspec  # the extension point definitions
 from .exceptions import PrintHelp
 from .exceptions import UsageError
diff --git a/src/_pytest/deprecated.py b/src/_pytest/deprecated.py
index 39c8c23cd..c06908932 100644
--- a/src/_pytest/deprecated.py
+++ b/src/_pytest/deprecated.py
@@ -19,11 +19,6 @@ DEPRECATED_EXTERNAL_PLUGINS = {
 }
 
 
-FIXTURE_NAMED_REQUEST = PytestDeprecationWarning(
-    "'request' is a reserved name for fixtures and will raise an error in future versions"
-)
-
-
 FUNCARGNAMES = PytestDeprecationWarning(
     "The `funcargnames` attribute was an alias for `fixturenames`, "
     "since pytest 2.3 - use the newer attribute instead."
diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index 9a385fc42..46ef8c642 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -2,7 +2,6 @@ import functools
 import inspect
 import itertools
 import sys
-import warnings
 from collections import defaultdict
 from collections import deque
 from collections import OrderedDict
@@ -26,7 +25,6 @@ from _pytest.compat import getlocation
 from _pytest.compat import is_generator
 from _pytest.compat import NOTSET
 from _pytest.compat import safe_getattr
-from _pytest.deprecated import FIXTURE_NAMED_REQUEST
 from _pytest.outcomes import fail
 from _pytest.outcomes import TEST_OUTCOME
 
@@ -971,7 +969,13 @@ class FixtureFunctionMarker:
 
         name = self.name or function.__name__
         if name == "request":
-            warnings.warn(FIXTURE_NAMED_REQUEST)
+            location = getlocation(function)
+            fail(
+                "'request' is a reserved word for fixtures, use another name:\n  {}".format(
+                    location
+                ),
+                pytrace=False,
+            )
         function._pytestfixturefunction = self
         return function
 
diff --git a/testing/deprecated_test.py b/testing/deprecated_test.py
index e4a8f72bc..97b88e939 100644
--- a/testing/deprecated_test.py
+++ b/testing/deprecated_test.py
@@ -1,8 +1,6 @@
 import pytest
 from _pytest import deprecated
 
-pytestmark = pytest.mark.pytester_example_path("deprecated")
-
 
 @pytest.mark.filterwarnings("default")
 def test_resultlog_is_deprecated(testdir):
@@ -46,13 +44,3 @@ def test_external_plugins_integrated(testdir, plugin):
 
     with pytest.warns(pytest.PytestConfigWarning):
         testdir.parseconfig("-p", plugin)
-
-
-def test_fixture_named_request(testdir):
-    testdir.copy_example()
-    result = testdir.runpytest()
-    result.stdout.fnmatch_lines(
-        [
-            "*'request' is a reserved name for fixtures and will raise an error in future versions"
-        ]
-    )
diff --git a/testing/example_scripts/deprecated/test_fixture_named_request.py b/testing/example_scripts/fixtures/test_fixture_named_request.py
similarity index 100%
rename from testing/example_scripts/deprecated/test_fixture_named_request.py
rename to testing/example_scripts/fixtures/test_fixture_named_request.py
diff --git a/testing/python/fixtures.py b/testing/python/fixtures.py
index c2484a8a2..e5bc25a1c 100644
--- a/testing/python/fixtures.py
+++ b/testing/python/fixtures.py
@@ -1126,21 +1126,6 @@ class TestFixtureUsages:
         values = reprec.getfailedcollections()
         assert len(values) == 1
 
-    def test_request_can_be_overridden(self, testdir):
-        testdir.makepyfile(
-            """
-            import pytest
-            @pytest.fixture()
-            def request(request):
-                request.a = 1
-                return request
-            def test_request(request):
-                assert request.a == 1
-        """
-        )
-        reprec = testdir.inline_run("-Wignore::pytest.PytestDeprecationWarning")
-        reprec.assertoutcome(passed=1)
-
     def test_usefixtures_marker(self, testdir):
         testdir.makepyfile(
             """
@@ -3973,3 +3958,14 @@ def test_fixture_param_shadowing(testdir):
     result.stdout.fnmatch_lines(["*::test_normal_fixture[[]a[]]*"])
     result.stdout.fnmatch_lines(["*::test_normal_fixture[[]b[]]*"])
     result.stdout.fnmatch_lines(["*::test_indirect[[]1[]]*"])
+
+
+def test_fixture_named_request(testdir):
+    testdir.copy_example("fixtures/test_fixture_named_request.py")
+    result = testdir.runpytest()
+    result.stdout.fnmatch_lines(
+        [
+            "*'request' is a reserved word for fixtures, use another name:",
+            "  *test_fixture_named_request.py:5",
+        ]
+    )