diff --git a/nixos/tests/nginx-http3.nix b/nixos/tests/nginx-http3.nix
index 1d6cd56294be..1c0326d0f0f6 100644
--- a/nixos/tests/nginx-http3.nix
+++ b/nixos/tests/nginx-http3.nix
@@ -90,6 +90,7 @@ builtins.listToAttrs (
 
           server.wait_for_unit("nginx")
           server.wait_for_open_port(443)
+          client.wait_for_unit("network-online.target")
 
           # Check http connections
           client.succeed("curl --verbose --http3-only https://acme.test | grep 'Hello World!'")