diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 066147a..49256ec 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -1060,10 +1060,14 @@
                     sizeof( ssl->handshake->state_local.finished_out.digest ),
                     &ssl->handshake->state_local.finished_out.digest_len,
                     ssl->conf->endpoint );
-
+    if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+    {
+        mbedtls_platform_zeroize( &ssl->handshake->tls13_hs_secrets,
+                                  sizeof(ssl->handshake->tls13_hs_secrets));
+    }
     if( ret != 0 )
     {
-         MBEDTLS_SSL_DEBUG_RET( 1, "calculate_verify_data failed", ret );
+        MBEDTLS_SSL_DEBUG_RET( 1, "calculate_verify_data failed", ret );
         return( ret );
     }