diff --git a/tests/remote-builds.nix b/tests/remote-builds.nix
index 201ca9dba..de127b8ae 100644
--- a/tests/remote-builds.nix
+++ b/tests/remote-builds.nix
@@ -72,6 +72,7 @@ in
       $client->succeed("chmod 600 /root/.ssh/id_dsa");
 
       # Install the SSH key on the slaves.
+      $client->waitForJob("network-interfaces");
       foreach my $slave ($slave1, $slave2) {
           $slave->succeed("mkdir -m 700 /root/.ssh");
           $slave->copyFileFromHost("key.pub", "/root/.ssh/authorized_keys");