diff --git a/tests/suites/test_suite_ecdh.function b/tests/suites/test_suite_ecdh.function
index 52fecf3..7144763 100644
--- a/tests/suites/test_suite_ecdh.function
+++ b/tests/suites/test_suite_ecdh.function
@@ -129,6 +129,8 @@
     const unsigned char *vbuf;
     size_t len;
     rnd_pseudo_info rnd_info;
+    unsigned char res_buf[1000];
+    size_t res_len;
 
     mbedtls_ecdh_init( &srv );
     mbedtls_ecdh_init( &cli );
@@ -147,9 +149,11 @@
     TEST_ASSERT( mbedtls_ecdh_read_public( &srv, buf, len ) == 0 );
 
     TEST_ASSERT( mbedtls_ecdh_calc_secret( &srv, &len, buf, 1000,
-                                   &rnd_pseudo_rand, &rnd_info ) == 0 );
-    TEST_ASSERT( mbedtls_ecdh_calc_secret( &cli, &len, buf, 1000, NULL, NULL ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &srv.z, &cli.z ) == 0 );
+                                           &rnd_pseudo_rand, &rnd_info ) == 0 );
+    TEST_ASSERT( mbedtls_ecdh_calc_secret( &cli, &res_len, res_buf, 1000,
+                                           NULL, NULL ) == 0 );
+    TEST_ASSERT( len == res_len );
+    TEST_ASSERT( memcmp( buf, res_buf, len ) == 0 );
 
 exit:
     mbedtls_ecdh_free( &srv );
@@ -172,7 +176,9 @@
     unsigned char rnd_buf_B[MBEDTLS_ECP_MAX_BYTES];
     rnd_buf_info rnd_info_A, rnd_info_B;
     int cnt_restart;
+    mbedtls_ecp_group grp;
 
+    mbedtls_ecp_group_init( &grp );
     mbedtls_ecdh_init( &srv );
     mbedtls_ecdh_init( &cli );
 
@@ -184,16 +190,20 @@
     rnd_info_B.buf = rnd_buf_B;
     rnd_info_B.length = unhexify( rnd_buf_B, dB_str );
 
-    TEST_ASSERT( mbedtls_ecp_group_load( &srv.grp, id ) == 0 );
+    /* The ECDH context is not guaranteed ot have an mbedtls_ecp_group structure
+     * in every configuration, therefore we load it separately. */
+    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );
 
-    /* otherwise we would have to fix the random buffer,
-     * as in ecdh_primitive_test_vec */
-    TEST_ASSERT( srv.grp.nbits % 8 == 0 );
+    /* Otherwise we would have to fix the random buffer,
+     * as in ecdh_primitive_testvec. */
+    TEST_ASSERT( grp.nbits % 8 == 0 );
+
+    TEST_ASSERT( mbedtls_ecdh_setup( &srv, id ) == 0 );
 
     /* set up restart parameters */
     mbedtls_ecp_set_max_ops( max_ops );
 
-    if( enable)
+    if( enable )
     {
         mbedtls_ecdh_enable_restart( &srv );
         mbedtls_ecdh_enable_restart( &cli );
@@ -269,12 +279,13 @@
     TEST_ASSERT( memcmp( buf, z, len ) == 0 );
 
 exit:
+    mbedtls_ecp_group_free( &grp );
     mbedtls_ecdh_free( &srv );
     mbedtls_ecdh_free( &cli );
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:MBEDTLS_ECDH_LEGACY_CONTEXT */
 void ecdh_exchange_legacy( int id )
 {
     mbedtls_ecdh_context srv, cli;