diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index a21ad47..03b9bae 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -345,7 +345,7 @@
 
     issuer_key_type = mbedtls_pk_get_type(&issuer_key);
 
-#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 (pk_wrap == 1 && issuer_key_type == MBEDTLS_PK_RSA) {
         TEST_ASSERT(mbedtls_pk_setup_rsa_alt(&issuer_key_alt,