diff --git a/include/msgpack/v1/unpack.hpp b/include/msgpack/v1/unpack.hpp
index bd0ebd2c..6d9922bf 100644
--- a/include/msgpack/v1/unpack.hpp
+++ b/include/msgpack/v1/unpack.hpp
@@ -24,7 +24,7 @@
 #if !defined(MSGPACK_USE_CPP03)
 #if defined(__APPLE__)
 #include <libkern/OSAtomic.h>
-#else
+#elif
 #include <atomic>
 #endif // __APPLE__
 #endif // MSGPACK_USE_CPP03
diff --git a/include/msgpack/v1/unpack_decl.hpp b/include/msgpack/v1/unpack_decl.hpp
index daca6205..bf00820b 100644
--- a/include/msgpack/v1/unpack_decl.hpp
+++ b/include/msgpack/v1/unpack_decl.hpp
@@ -24,7 +24,7 @@
 #if !defined(MSGPACK_USE_CPP03)
 #if defined(__APPLE__)
 #include <libkern/OSAtomic.h>
-#else
+#elif
 #include <atomic>
 #endif // __APPLE__
 #endif // MSGPACK_USE_CPP03