diff --git a/src/Common/FileCache.h b/src/Common/FileCache.h
index 00cbe8d0373..2b156926702 100644
--- a/src/Common/FileCache.h
+++ b/src/Common/FileCache.h
@@ -219,7 +219,7 @@ private:
 
     size_t availableSize() const { return max_size - current_size; }
 
-    void loadCacheInfoIntoMemory(std::lock_guard<std::mutex> &cache_lock);
+    void loadCacheInfoIntoMemory(std::lock_guard<std::mutex> & cache_lock);
 
     FileSegments splitRangeIntoCells(
         const Key & key, size_t offset, size_t size, FileSegment::State state, std::lock_guard<std::mutex> & cache_lock);