diff --git a/docs/user-guides/debugging-techniques.rst b/docs/user-guides/debugging-techniques.rst
index 2d4768d8..36c212e1 100644
--- a/docs/user-guides/debugging-techniques.rst
+++ b/docs/user-guides/debugging-techniques.rst
@@ -1075,7 +1075,7 @@ going to need it because of a recurring problem::
                 pass
 
     _thread = threading.Thread(target=_monitor)
-    _thread.setDaemon(True)
+    _thread.daemon = True
 
     def _exiting():
         try:
diff --git a/docs/user-guides/reloading-source-code.rst b/docs/user-guides/reloading-source-code.rst
index 4419ada2..f0a4ad77 100644
--- a/docs/user-guides/reloading-source-code.rst
+++ b/docs/user-guides/reloading-source-code.rst
@@ -355,7 +355,7 @@ with how mod_wsgi works is shown below::
                 pass
 
     _thread = threading.Thread(target=_monitor)
-    _thread.setDaemon(True)
+    _thread.daemon = True
 
     def _exiting():
         try:
diff --git a/src/server/__init__.py b/src/server/__init__.py
index f2d8632f..55d2f8e6 100644
--- a/src/server/__init__.py
+++ b/src/server/__init__.py
@@ -1267,7 +1267,7 @@ def _monitor():
             pass
 
 _thread = threading.Thread(target=_monitor)
-_thread.setDaemon(True)
+_thread.daemon = True
 
 def _exiting():
     try: