diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 3ad7e71941..42d69b43a2 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -873,6 +873,7 @@ void mbedtls_ecp_group_metadata( int id, int bit_size, int crv_type,
     TEST_EQUAL( mbedtls_ecp_tls_read_group_id( &read_g_id, &vbuf, olen ),
                 0 );
     TEST_EQUAL( read_g_id, id );
+    vbuf = buf;
     TEST_EQUAL( mbedtls_ecp_tls_read_group( &grp_read, &vbuf, olen ),
                 0 );
     TEST_EQUAL( grp_read.id, id );