diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index a4c86e2..aefb57a 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -1044,11 +1044,16 @@
 {
     int ret = 0;
     mbedtls_ecp_keypair key;
-    mbedtls_ecp_keypair key2;
-
     mbedtls_ecp_keypair_init(&key);
+    mbedtls_ecp_keypair key2;
     mbedtls_ecp_keypair_init(&key2);
 
+#if defined(MBEDTLS_BIGNUM_C)
+    TEST_EQUAL(mbedtls_mpi_lset(&key.Q.X, 1), 0);
+    TEST_EQUAL(mbedtls_mpi_lset(&key.Q.Y, 2), 0);
+    TEST_EQUAL(mbedtls_mpi_lset(&key.Q.Z, 3), 0);
+#endif
+
     ret = mbedtls_ecp_read_key(grp_id, &key, in_key->x, in_key->len);
     TEST_ASSERT(ret == expected);
 
@@ -1057,6 +1062,12 @@
         ret = mbedtls_ecp_check_privkey(&key.grp, &key.d);
         TEST_ASSERT(ret == 0);
 
+#if defined(MBEDTLS_BIGNUM_C)
+        TEST_EQUAL(mbedtls_mpi_cmp_int(&key.Q.X, 1), 0);
+        TEST_EQUAL(mbedtls_mpi_cmp_int(&key.Q.Y, 2), 0);
+        TEST_EQUAL(mbedtls_mpi_cmp_int(&key.Q.Z, 3), 0);
+#endif
+
         if (canonical) {
             unsigned char buf[MBEDTLS_ECP_MAX_BYTES];