diff --git a/service/jni/com_android_server_connectivity_ClatCoordinator.cpp b/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
index 500c696..ba836b2 100644
--- a/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
+++ b/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
@@ -314,7 +314,11 @@
     }
 
     // TODO: use android::base::ScopeGuard.
-    if (int ret = posix_spawnattr_setflags(&attr, POSIX_SPAWN_USEVFORK)) {
+    if (int ret = posix_spawnattr_setflags(&attr, POSIX_SPAWN_USEVFORK
+#ifdef POSIX_SPAWN_CLOEXEC_DEFAULT
+                                           | POSIX_SPAWN_CLOEXEC_DEFAULT
+#endif
+                                           )) {
         posix_spawnattr_destroy(&attr);
         throwIOException(env, "posix_spawnattr_setflags failed", ret);
         return -1;