diff --git a/tests/test_server.py b/tests/test_server.py
index 9805806..93087b4 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -279,6 +279,18 @@ class OneServer(unittest.TestCase):
         r = conn.getresponse()
         self.assertEqual(r.status, 403, r.read())
 
+    @unittest.skipIf(os.name == "nt", "no SIGTERM on Windows")
+    def test_sigterm_while_the_app_holds_stdin_exits_cleanly(self):
+        """The app keeps stdin open; a stop signal used to abort Python (SIGABRT) at exit."""
+        env = {**os.environ, "FRAME_CONTROL_DATA_DIR": tempfile.mkdtemp(prefix="frame-one-server-"),
+               "FRAME_ALIAS": "frame-control-test.invalid"}
+        proc = subprocess.Popen([sys.executable, str(ROOT / "ui" / "server.py"), "--port", "0", "--exit-on-eof"],
+                                env=env, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
+        self.addCleanup(lambda: (proc.stdin.close(), proc.stdout.close()))
+        self.assertIn("Frame Control on", proc.stdout.readline())
+        proc.terminate()
+        self.assertEqual(proc.wait(30), 0, proc.stdout.read())
+
 
 class ArtworkSettings(unittest.TestCase):
     """The settings panel's endpoints, with and without the page's X-Frame-UI key."""
diff --git a/ui/server.py b/ui/server.py
index 7771b72..b25975a 100755
--- a/ui/server.py
+++ b/ui/server.py
@@ -2656,12 +2656,16 @@ def main():
         signal.signal(signal.SIGTERM, lambda *_: (_ for _ in ()).throw(KeyboardInterrupt))
     if args.exit_on_eof:
         def watch_stdin():
-            sys.stdin.buffer.read()
+            # os.read, not sys.stdin.buffer.read: a buffered read holds stdin's lock,
+            # and if a signal stops the server first, Python aborts (SIGABRT) at exit
+            # when it can't take that lock back from this thread.
+            while os.read(0, 4096):
+                pass
             threading.Thread(target=httpd.shutdown, daemon=True).start()
         threading.Thread(target=watch_stdin, daemon=True).start()
-    # The real port, which --port 0 leaves to the system (the iPhone app reads it from here).
-    print(f"Frame Control on http://127.0.0.1:{httpd.server_address[1]}  (alias: {FRAME}; Ctrl-C to stop)", flush=True)
     try:
+        # The real port, which --port 0 leaves to the system (the iPhone app reads it from here).
+        print(f"Frame Control on http://127.0.0.1:{httpd.server_address[1]}  (alias: {FRAME}; Ctrl-C to stop)", flush=True)
         httpd.serve_forever()
     except KeyboardInterrupt:
         pass