diff --git a/include/hardware/keymaster_defs.h b/include/hardware/keymaster_defs.h
index 7d1b348..e58d56a 100644
--- a/include/hardware/keymaster_defs.h
+++ b/include/hardware/keymaster_defs.h
@@ -182,6 +182,7 @@
 
     /* Block ciphers algorithms */
     KM_ALGORITHM_AES = 32,
+    KM_ALGORITHM_TRIPLE_DES = 33,
 
     /* MAC algorithms */
     KM_ALGORITHM_HMAC = 128,