diff --git a/include/boost/fusion/include/has_key.hpp b/include/boost/fusion/include/has_key.hpp
index 4eef64a1..b696241d 100644
--- a/include/boost/fusion/include/has_key.hpp
+++ b/include/boost/fusion/include/has_key.hpp
@@ -5,7 +5,7 @@
     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 ==============================================================================*/
 #if !defined(FUSION_INCLUDE_HAS_KEY)
-#define FUSION_INCLUDE_EMPTY
+#define FUSION_INCLUDE_HAS_KEY
 
 #include <boost/fusion/sequence/intrinsic/has_key.hpp>