diff --git a/config/run-and-prefix.py b/config/run-and-prefix.py
index a6cd45ba97c1..bc96eb76f016 100644
--- a/config/run-and-prefix.py
+++ b/config/run-and-prefix.py
@@ -21,7 +21,8 @@ args = sys.argv[2:]
 p = subprocess.Popen(args, bufsize=0,
                      stdout=subprocess.PIPE,
                      stderr=subprocess.STDOUT,
-                     stdin=sys.stdin.fileno())
+                     stdin=sys.stdin.fileno(),
+                     close_fds=False)
 
 while True:
     data = p.stdout.readline()