diff --git a/include/json/reader.h b/include/json/reader.h
index 9a8a4e3..0a1574f 100644
--- a/include/json/reader.h
+++ b/include/json/reader.h
@@ -268,7 +268,7 @@ public:
       char const* beginDoc, char const* endDoc,
       Value* root, std::string* errs) = 0;
 
-  class Factory {
+  class JSON_API Factory {
   public:
     virtual ~Factory() {}
     /** \brief Allocate a CharReader via operator new().