diff --git a/poetry/packages/locker.py b/poetry/packages/locker.py
index fad5837f062..d1dbc6c5fc7 100644
--- a/poetry/packages/locker.py
+++ b/poetry/packages/locker.py
@@ -177,7 +177,7 @@ def set_lock_data(self, root, packages):  # type: (...) -> bool
             del package["files"]
 
         lock = document()
-        lock.add(comment("@generated"))
+        lock.add(comment("@" + "generated"))
         lock["package"] = packages
 
         if root.extras: