diff --git a/.zuul.yaml b/.zuul.yaml
index d3410d40..b9a84ee7 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -38,14 +38,23 @@
       - ^releasenotes/.*$
       - ^\.pre-commit-config\.yaml$
 
+- job:
+    name: oslo.log-tox-py312-eventlet-patched
+    parent: openstack-tox-py312
+    vars:
+      tox_environment:
+        OSLO_LOG_TEST_EVENTLET: 1
+
 - project:
     check:
       jobs:
         - oslo.log-src-grenade
         - oslo.log-jsonformatter
+        - oslo.log-tox-py312-eventlet-patched
     gate:
       jobs:
         - oslo.log-jsonformatter
+        - oslo.log-tox-py312-eventlet-patched
     templates:
       - check-requirements
       - lib-forward-testing-python3
diff --git a/oslo_log/pipe_mutex.py b/oslo_log/pipe_mutex.py
index 84884cfa..3751e768 100644
--- a/oslo_log/pipe_mutex.py
+++ b/oslo_log/pipe_mutex.py
@@ -15,13 +15,15 @@
 
 import errno
 import fcntl
-import os
 
 import eventlet
 import eventlet.debug
 import eventlet.greenthread
 import eventlet.hubs
 
+# We want the blocking APIs, because we set file descriptors to non-blocking.
+os = eventlet.patcher.original("os")
+
 
 class PipeMutex:
     """Mutex using a pipe.
diff --git a/oslo_log/tests/__init__.py b/oslo_log/tests/__init__.py
index e69de29b..f670b8fc 100644
--- a/oslo_log/tests/__init__.py
+++ b/oslo_log/tests/__init__.py
@@ -0,0 +1,5 @@
+import os
+
+if os.environ.get("OSLO_LOG_TEST_EVENTLET") == "1":
+    import eventlet
+    eventlet.monkey_patch()
diff --git a/tox.ini b/tox.ini
index 29a8963e..0375cc6c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,9 +7,11 @@ ignore_basepython_conflict = true
 basepython = python3
 allowlist_externals =
   find
+  env
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
+passenv = OSLO_LOG_TEST_EVENTLET
 commands =
   find . -type f -name "*.pyc" -delete
   stestr run {posargs}