diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index c7b15824b4..f6eeeabe1f 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -6963,6 +6963,8 @@ void tls13_record_boundary_alignment(int endpoint, int handshake_message)
     int ret = -1;
     int target_state, peer_target_state, encrypted;
     mbedtls_test_ssl_endpoint client_ep, server_ep;
+    memset(&client_ep, 0, sizeof(client_ep));
+    memset(&server_ep, 0, sizeof(server_ep));
 
     mbedtls_test_handshake_test_options client_options, server_options;
     mbedtls_test_init_handshake_options(&client_options);