diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 6896416629..607ed49dd8 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -769,7 +769,7 @@ struct mbedtls_ssl_handshake_params
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
 
 #if defined(MBEDTLS_SSL_CLI_C)
-    int client_auth;           /*!< used to check if CertificateRequest has been
+    uint8_t client_auth;       /*!< used to check if CertificateRequest has been
                                     received from server side. If CertificateReqeust
                                     has been received, Certificate and CertificateVerify
                                     should be sent to server */