diff --git a/auth.h b/auth.h
index bf47b9a..8b814ba 100644
--- a/auth.h
+++ b/auth.h
@@ -191,4 +191,9 @@
 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
 
 #define SKEY_PROMPT "\nS/Key Password: "
+
+#if defined(KRB5) && !defined(HEIMDAL)
+#include <krb5.h>
+krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);
+#endif
 #endif