diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 69755bd19..f65fb1b2e 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -678,7 +678,8 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
                 alive.insert(start);
                 try {
                     StorePathSet closure;
-                    computeFSClosure(*path, closure);
+                    computeFSClosure(*path, closure,
+                        /* flipDirection */ false, gcKeepOutputs, gcKeepDerivations);
                     for (auto & p : closure)
                         alive.insert(p);
                 } catch (InvalidPath &) { }