diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index 36c89bee9..b50ff1f86 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -1777,7 +1777,7 @@ void LocalDerivationGoal::runChild()
                     if (pathExists(path))
                         ss.push_back(path);
 
-                dirsInChroot.emplace(settings.caFile, "/etc/ssl/certs/ca-certificates.crt");
+                dirsInChroot.try_emplace("/etc/ssl/certs/ca-certificates.crt", settings.caFile, true);
             }
 
             for (auto & i : ss) dirsInChroot.emplace(i, i);