diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index fc953a1..989d895 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -117,10 +117,13 @@
                 data[i] = ( i & 0xff ) ^ rec_num;
 
             /* Get the function's result */
+            TEST_CF_SECRET( &in_len, sizeof( in_len ) );
             TEST_ASSERT( 0 == mbedtls_ssl_cf_hmac( &ctx, add_data, sizeof( add_data ),
                                                    data, in_len,
                                                    min_in_len, max_in_len,
                                                    out ) );
+            TEST_CF_PUBLIC( &in_len, sizeof( in_len ) );
+            TEST_CF_PUBLIC( out, out_len );
 
             /* Compute the reference result */
             TEST_ASSERT( 0 == mbedtls_md_hmac_update( &ref_ctx, add_data,