diff --git a/include/rexy/string_base.hpp b/include/rexy/string_base.hpp
index d3f655e..bc3107c 100644
--- a/include/rexy/string_base.hpp
+++ b/include/rexy/string_base.hpp
@@ -472,7 +472,7 @@ namespace{
 #ifdef REXY_BINARY_BASE_HPP
 #include "detail/binary_string_conv.hpp"
 #endif
-#ifdef REXY_CX_HASH_HPP
+#ifdef REXY_HASH_HPP
 #include "static_string_hash.hpp"
 #endif