diff --git a/lib/des/mdtest.c b/lib/des/mdtest.c
index f58e4be84..b3c56f082 100644
--- a/lib/des/mdtest.c
+++ b/lib/des/mdtest.c
@@ -41,6 +41,9 @@ RCSID("$Id$");
 #include <stdlib.h>
 #endif
 #include <string.h>
+#ifdef KRB5
+#include <krb5-types.h>
+#endif
 #include <md4.h>
 #include <md5.h>
 #include <sha.h>