diff --git a/nixos/tests/common/acme/server/generate-certs.nix b/nixos/tests/common/acme/server/generate-certs.nix
index 85c751c56ad5c..4f38ca309b05b 100644
--- a/nixos/tests/common/acme/server/generate-certs.nix
+++ b/nixos/tests/common/acme/server/generate-certs.nix
@@ -15,7 +15,7 @@ in mkDerivation {
       sed -i 's_NotAfter: time.Now().AddDate(2, 0, 30),_NotAfter: time.Now().AddDate(20, 0, 0),_' main.go
     '';
   })) ];
-  phases = [ "buildPhase" "installPhase" ];
+  dontUnpack = true;
 
   buildPhase = ''
     minica \