diff --git a/src/xercesc/validators/common/GrammarResolver.hpp b/src/xercesc/validators/common/GrammarResolver.hpp
index 17a6476a3dda7428254864f7def1fd0cfa456768..1734f200f84e4e83f993cfd40ee8c8d4d0bd4b24 100644
--- a/src/xercesc/validators/common/GrammarResolver.hpp
+++ b/src/xercesc/validators/common/GrammarResolver.hpp
@@ -79,7 +79,7 @@ class DatatypeValidatorFactory;
  *
  */
 
-class GrammarResolver {
+class VALIDATORS_EXPORT GrammarResolver {
 public:
 
     /** @name Constructor and Destructor */