diff --git a/src/libstore/build/sandbox-defaults.sb b/src/libstore/build/sandbox-defaults.sb
index 2ad5fb616..e02b3ef29 100644
--- a/src/libstore/build/sandbox-defaults.sb
+++ b/src/libstore/build/sandbox-defaults.sb
@@ -46,6 +46,7 @@ R""(
 (if (param "_ALLOW_LOCAL_NETWORKING")
     (begin
       (allow network* (remote ip "localhost:*"))
+      (allow network-inbound (local ip "*:*")) ; required to bind and listen
 
       ; Allow access to /etc/resolv.conf (which is a symlink to
       ; /private/var/run/resolv.conf).