diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index a2b245240..f70ab8108 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3249,6 +3249,8 @@ void DerivationGoal::registerOutputs()
         info.ultimate = true;
         worker.store.signPathInfo(info);
 
+        if (!info.references.empty()) info.ca.clear();
+
         infos.push_back(info);
     }