diff --git a/include/msgpack/v1/unpack_decl.hpp b/include/msgpack/v1/unpack_decl.hpp
index c63f2d7d..99896fa4 100644
--- a/include/msgpack/v1/unpack_decl.hpp
+++ b/include/msgpack/v1/unpack_decl.hpp
@@ -25,6 +25,7 @@
 #include <atomic>
 #endif
 
+
 #if defined(_MSC_VER)
 // avoiding confliction std::max, std::min, and macro in windows.h
 #ifndef NOMINMAX