diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 02f6cd369..27bbafa06 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -1727,7 +1727,7 @@ static int ssl_parse_server_ecdh_params(mbedtls_ssl_context *ssl,
                                         unsigned char *end)
 {
     uint16_t tls_id;
-    uint8_t ecpoint_len;
+    size_t ecpoint_len;
     mbedtls_ssl_handshake_params *handshake = ssl->handshake;
     psa_key_type_t key_type = PSA_KEY_TYPE_NONE;
     size_t ec_bits = 0;