diff --git a/src/libtls/tls_crypto.c b/src/libtls/tls_crypto.c
index 6b4651393..a48393f38 100644
--- a/src/libtls/tls_crypto.c
+++ b/src/libtls/tls_crypto.c
@@ -494,7 +494,7 @@ static suite_algs_t suite_algs[] = {
 	{ TLS_CHACHA20_POLY1305_SHA256,
 		KEY_ANY, MODP_NONE,
 		HASH_SHA256, PRF_UNDEFINED,
-		AUTH_HMAC_SHA2_256_256, ENCR_CHACHA20_POLY1305, 16,
+		AUTH_HMAC_SHA2_256_256, ENCR_CHACHA20_POLY1305, 32,
 		TLS_1_3,
 	},
 	{ TLS_AES_128_CCM_SHA256,