diff --git a/tests/nixos/content-encoding.nix b/tests/nixos/content-encoding.nix
index debee377b..1e188cb06 100644
--- a/tests/nixos/content-encoding.nix
+++ b/tests/nixos/content-encoding.nix
@@ -131,6 +131,7 @@ in
     start_all()
 
     machine.wait_for_unit("nginx.service")
+    machine.wait_for_open_port(80)
 
     # Original test: zstd archive with gzip content-encoding
     # Make sure that the file is properly compressed as the test would be meaningless otherwise