diff --git a/attn/attn_monitor.hpp b/attn/attn_monitor.hpp
index 9680fda..f9f13e4 100644
--- a/attn/attn_monitor.hpp
+++ b/attn/attn_monitor.hpp
@@ -15,7 +15,7 @@
 class AttnMonitor
 {
   public:
-    AttnMonitor()  = delete;
+    AttnMonitor() = delete;
     ~AttnMonitor() = default;
 
     /** @brief Constructs AttnMonitor object.