diff --git a/pkgs/applications/virtualization/docker/default.nix b/pkgs/applications/virtualization/docker/default.nix
index 1ffa016159aa..e18f8dab8475 100644
--- a/pkgs/applications/virtualization/docker/default.nix
+++ b/pkgs/applications/virtualization/docker/default.nix
@@ -254,7 +254,7 @@ rec {
     passthru = {
       # Exposed for tarsum build on non-linux systems (build-support/docker/default.nix)
       inherit moby-src;
-      tests = lib.optionals (!clientOnly) { inherit (nixosTests) docker; };
+      tests = lib.optionalAttrs (!clientOnly) { inherit (nixosTests) docker; };
     };
 
     meta = with lib; {