diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 7f50b43f2..81768e4eb 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -232,7 +232,8 @@ LocalStore::LocalStore(ref<const Config> config)
             globalLock = openLockFile(globalLockPath.c_str(), true);
         } catch (SysError & e) {
             if (e.errNo == EACCES || e.errNo == EPERM) {
-                e.addTrace({},
+                e.addTrace(
+                    {},
                     "This command may have been run as non-root in a single-user Nix installation,\n"
                     "or the Nix daemon may have crashed.");
             }