diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index b5b0f1ba7..e9dd3f96e 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -54,6 +54,7 @@ LocalStore::LocalStore(const Params & params)
     , trashDir(realStoreDir + "/trash")
     , tempRootsDir(stateDir + "/temproots")
     , fnTempRoots(fmt("%s/%d", tempRootsDir, getpid()))
+    , locksHeld(tokenizeString<PathSet>(getEnv("NIX_HELD_LOCKS").value_or("")))
 {
     auto state(_state.lock());