diff -r 5c0247a6f98a Modules/_posixsubprocess.c
--- a/Modules/_posixsubprocess.c	Fri Apr 24 12:02:53 2015 -0400
+++ b/Modules/_posixsubprocess.c	Fri Apr 24 13:47:43 2015 -0700
@@ -14,6 +14,9 @@
 #ifdef HAVE_SYS_SYSCALL_H
 #include <sys/syscall.h>
 #endif
+#if defined(HAVE_SYS_RESOURCE_H)
+#include <sys/resource.h>
+#endif
 #ifdef HAVE_DIRENT_H
 #include <dirent.h>
 #endif
@@ -174,6 +177,11 @@
     if (local_max_fd >= 0)
         return local_max_fd;
 #endif
+#if defined(HAVE_SYS_RESOURCE_H) && defined(__OpenBSD__)
+    struct rlimit rl;
+    if (getrlimit(RLIMIT_NOFILE, &rl) >= 0)
+        return (long) rl.rlim_max;
+#endif
 #ifdef _SC_OPEN_MAX
     local_max_fd = sysconf(_SC_OPEN_MAX);
     if (local_max_fd == -1)