diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 9dcee84..73e2298 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -2598,22 +2598,22 @@
     TEST_EQUAL( ret, exp_ret_val )
 #endif
 
-#define TEST_AVAILABLE_ECC( _tls_id, _group_id, _psa_family, _psa_bits ) \
-    TEST_EQUAL( mbedtls_ssl_get_ecp_group_id_from_tls_id( _tls_id ),     \
-                _group_id );                                             \
-    TEST_EQUAL( mbedtls_ssl_get_tls_id_from_ecp_group_id( _group_id ),   \
-                _tls_id );                                               \
-    TEST_EQUAL( mbedtls_ssl_get_psa_curve_info_from_tls_id( _tls_id,     \
-                    &psa_family, &psa_bits), PSA_SUCCESS );             \
-    TEST_EQUAL( _psa_family, psa_family );                               \
-    TEST_EQUAL( _psa_bits, psa_bits );
+#define TEST_AVAILABLE_ECC( tls_id_, group_id_, psa_family_, psa_bits_ )   \
+    TEST_EQUAL( mbedtls_ssl_get_ecp_group_id_from_tls_id( tls_id_ ),       \
+                    group_id_ );                                           \
+    TEST_EQUAL( mbedtls_ssl_get_tls_id_from_ecp_group_id( group_id_ ),     \
+                    tls_id_ );                                             \
+    TEST_EQUAL( mbedtls_ssl_get_psa_curve_info_from_tls_id( tls_id_,       \
+                    &psa_family, &psa_bits), PSA_SUCCESS );                \
+    TEST_EQUAL( psa_family_, psa_family );                                 \
+    TEST_EQUAL( psa_bits_, psa_bits );
 
-#define TEST_UNAVAILABLE_ECC( _tls_id, _group_id, _psa_family, _psa_bits )  \
-    TEST_EQUAL( mbedtls_ssl_get_ecp_group_id_from_tls_id( _tls_id ),     \
-                    MBEDTLS_ECP_DP_NONE );                              \
-    TEST_EQUAL( mbedtls_ssl_get_tls_id_from_ecp_group_id( _group_id ),   \
-                0 );                                                    \
-    TEST_EQUAL( mbedtls_ssl_get_psa_curve_info_from_tls_id( _tls_id,     \
+#define TEST_UNAVAILABLE_ECC( tls_id_, group_id_, psa_family_, psa_bits_ ) \
+    TEST_EQUAL( mbedtls_ssl_get_ecp_group_id_from_tls_id( tls_id_ ),       \
+                    MBEDTLS_ECP_DP_NONE );                                 \
+    TEST_EQUAL( mbedtls_ssl_get_tls_id_from_ecp_group_id( group_id_ ),     \
+                    0 );                                                   \
+    TEST_EQUAL( mbedtls_ssl_get_psa_curve_info_from_tls_id( tls_id_,       \
                     &psa_family, &psa_bits), PSA_ERROR_NOT_SUPPORTED );
 
 /* END_HEADER */