diff --git a/include/security/oath.h b/include/security/oath.h
index 733fc46..3329042 100644
--- a/include/security/oath.h
+++ b/include/security/oath.h
@@ -44,7 +44,7 @@ char *oath_key_to_uri(const struct oath_key *);
 
 #define DUMMY_LABEL	("oath-dummy-key")
 #define DUMMY_LABELLEN	(sizeof DUMMY_LABEL)
-#define DUMMY_KEYLEN	80
+#define DUMMY_KEYLEN	64
 
 struct oath_key *oath_dummy_key(enum oath_mode, enum oath_hash, unsigned int);