diff --git a/library/cipher_wrap.c b/library/cipher_wrap.c
index c8eee54..5c98100 100644
--- a/library/cipher_wrap.c
+++ b/library/cipher_wrap.c
@@ -271,7 +271,7 @@
     POLARSSL_MODE_GCM,
     128,
     "AES-128-GCM",
-    16,
+    0,
     16,
     &gcm_aes_info
 };
@@ -281,7 +281,7 @@
     POLARSSL_MODE_GCM,
     256,
     "AES-256-GCM",
-    16,
+    0,
     16,
     &gcm_aes_info
 };