Index: Modules/_posixsubprocess.c
--- Modules/_posixsubprocess.c.orig
+++ Modules/_posixsubprocess.c
@@ -264,7 +264,7 @@ _close_fds_by_brute_force(long start_fd, PyObject *py_
         start_fd = keep_fd + 1;
     }
     if (start_fd <= end_fd) {
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
         /* Any errors encountered while closing file descriptors are ignored */
         closefrom(start_fd);
 #else