diff --git a/stdlib/os/__init__.pyi b/stdlib/os/__init__.pyi
index 5938901b6..fa4c55011 100644
--- a/stdlib/os/__init__.pyi
+++ b/stdlib/os/__init__.pyi
@@ -1101,3 +1101,4 @@ if sys.version_info >= (3, 12) and sys.platform == "linux":
     CLONE_THREAD: int
     CLONE_VM: int
     def unshare(flags: int) -> None: ...
+    def setns(fd: FileDescriptorLike, nstype: int = 0) -> None: ...
diff --git a/stdlib/posix.pyi b/stdlib/posix.pyi
index 3f327e110..ab6bf2e63 100644
--- a/stdlib/posix.pyi
+++ b/stdlib/posix.pyi
@@ -344,6 +344,7 @@ if sys.platform != "win32":
             CLONE_SYSVSEM as CLONE_SYSVSEM,
             CLONE_THREAD as CLONE_THREAD,
             CLONE_VM as CLONE_VM,
+            setns as setns,
             unshare as unshare,
         )
 
diff --git a/tests/stubtest_allowlists/linux-py312.txt b/tests/stubtest_allowlists/linux-py312.txt
index 9423e9413..7463b5ea2 100644
--- a/tests/stubtest_allowlists/linux-py312.txt
+++ b/tests/stubtest_allowlists/linux-py312.txt
@@ -1,6 +1,5 @@
 _?curses.color_pair
 _posixsubprocess.fork_exec
-(os|posix).setns
 resource.prlimit
 signal.sigtimedwait
 signal.sigwaitinfo