diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 56bdcfe..4ad49f1 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -8862,7 +8862,7 @@
 }
 
 /*
- * Unserialise session, see mbedtls_ssl_session_save().
+ * Unserialize session, see mbedtls_ssl_session_save().
  *
  * This internal version is wrapped by a public function that cleans up in
  * case of error.
@@ -8968,7 +8968,7 @@
 }
 
 /*
- * Unserialise session: public wrapper for error cleaning
+ * Unserialize session: public wrapper for error cleaning
  */
 int mbedtls_ssl_session_load( mbedtls_ssl_session *session,
                               const unsigned char *buf,