diff --git a/trunk/c5/xormac.h b/trunk/c5/xormac.h
index e7a848c2..6b5f1892 100644
--- a/trunk/c5/xormac.h
+++ b/trunk/c5/xormac.h
@@ -3,6 +3,7 @@
 #ifndef CRYPTOPP_XORMAC_H
 #define CRYPTOPP_XORMAC_H
 
+#include "seckey.h"
 #include "iterhash.h"
 #include "argnames.h"