diff --git a/others/lru_cache.cpp b/others/lru_cache.cpp
index d03c9b206..368de4e5f 100644
--- a/others/lru_cache.cpp
+++ b/others/lru_cache.cpp
@@ -134,6 +134,7 @@ class LRUCache {
     int getPageFault() const { return pageFault; }
 };
 
+}  // namespace others
 }  // namespace lru_cache
 
 namespace lru_tests {