diff --git a/src/ipc.c b/src/ipc.c
index dc34b7ed..0ffdfebf 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -1655,7 +1655,7 @@ void ipc_send_binding_event(const char *event_type, Binding *bind) {
  */
 void ipc_confirm_restart(ipc_client *client) {
     DLOG("ipc_confirm_restart(fd %d)\n", client->fd);
-    static const char *reply = "{\"success\":true}";
+    static const char *reply = "[{\"success\":true}]";
     ipc_send_client_message(
         client, strlen(reply), I3_IPC_REPLY_TYPE_COMMAND,
         (const uint8_t *)reply);
diff --git a/testcases/t/305-restart-reply.t b/testcases/t/305-restart-reply.t
new file mode 100644
index 00000000..0493d4ff
--- /dev/null
+++ b/testcases/t/305-restart-reply.t
@@ -0,0 +1,25 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Please read the following documents before working on tests:
+# • https://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • https://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • https://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • http://onyxneon.com/books/modern_perl/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+# Verify that restart produces a reply.
+# Ticket: #3565
+# Bug still in: 4.16-143-gca82f958
+use i3test;
+
+my $reply = cmd('restart');
+ok($reply->[0]->{success}, 'restart reply received');
+
+done_testing;