diff --git a/docs/source/conf.py b/docs/source/conf.py
index 05471e5..76d00c6 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -8,6 +8,13 @@
 
 import ctypes
 
+# Monkey-patch PROT_READ into mmap if missing (Windows), so that we can
+# import mss.linux.xshmgetimage while building the documentation.
+import mmap
+
+if not hasattr(mmap, "PROT_READ"):
+    mmap.PROT_READ = 1  # type:ignore[attr-defined]
+
 import mss
 
 # -- General configuration ------------------------------------------------
@@ -44,7 +51,6 @@
 ctypes.WINFUNCTYPE = ctypes.CFUNCTYPE  # type:ignore[attr-defined]
 ctypes.WinError = lambda _code=None, _descr=None: OSError()  # type:ignore[attr-defined]
 
-
 # -- Options for HTML output ----------------------------------------------
 
 html_theme = "shibuya"