diff --git a/doc/source/installation.rst b/doc/source/installation.rst
index 7c7a8ad..aebf51d 100644
--- a/doc/source/installation.rst
+++ b/doc/source/installation.rst
@@ -5,3 +5,8 @@ Installation
 At the command line::
 
     $ pip install oslo.log
+
+To use ``oslo_log.fixture``, some additional dependencies
+are needed. They can be installed using the ``fixtures`` extra::
+
+    $ pip install 'oslo.log[fixtures]'
diff --git a/setup.cfg b/setup.cfg
index 47c3725..542c4bd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,6 +23,10 @@ classifier =
 packages =
     oslo_log
 
+[extras]
+fixtures =
+  fixtures>=1.3.1
+
 [pbr]
 warnerrors = true
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 8634bd8..fd01ca0 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,6 @@
 hacking<0.11,>=0.10.0
 
 discover
-fixtures>=1.3.1
 python-subunit>=0.0.18
 testrepository>=0.0.18
 testscenarios>=0.4
diff --git a/tox.ini b/tox.ini
index 7b38c84..49ee6d1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,7 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+       -e.[fixtures]
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]