1 files changed, 5 insertions, 1 deletions
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index ccdde36ca..d00b23b6d 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -136,11 +136,15 @@ struct DerivationOutput : _DerivationOutputRaw
         const Store & store,
         std::string_view drvName,
         std::string_view outputName) const;
+    /**
+     * @param xpSettings Stop-gap to avoid globals during unit tests.
+     */
     static DerivationOutput fromJSON(
         const Store & store,
         std::string_view drvName,
         std::string_view outputName,
-        const nlohmann::json & json);
+        const nlohmann::json & json,
+        const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
 };
 
 typedef std::map<std::string, DerivationOutput> DerivationOutputs;