diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 0e763e63a..a80da545f 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -3071,8 +3071,8 @@ start_processing:
             mbedtls_ssl_send_alert_message(
                 ssl,
                 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-            return( MBEDTLS_ERR_SSL_DECODE_ERROR );
+                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
+            return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
         }
     }
     else