Fix undeclared dependency on RSA_ALT in tests
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 9237165..3b9f20f 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -134,7 +134,7 @@
TEST_ASSERT( mbedtls_pk_parse_keyfile( &issuer_key, issuer_key_file,
issuer_pwd ) == 0 );
-#if defined(MBEDTLS_RSA_C)
+#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/* For RSA PK contexts, create a copy as an alternative RSA context. */
if( rsa_alt == 1 && mbedtls_pk_get_type( &issuer_key ) == MBEDTLS_PK_RSA )
{