1 files changed, 1 insertions, 1 deletions
diff --git a/include/hmac.h b/include/hmac.h
index d757d9bf8..62529cf13 100644
--- a/include/hmac.h
+++ b/include/hmac.h
@@ -13,7 +13,7 @@ namespace Botan {
 /*************************************************
 * HMAC                                           *
 *************************************************/
-class HMAC : public MessageAuthenticationCode
+class BOTAN_DLL HMAC : public MessageAuthenticationCode
    {
    public:
       void clear() throw();