diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index b205b74..de6a106 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -6,7 +6,13 @@
 #include "mbedtls/oid.h"
 #include "mbedtls/rsa.h"
 
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
+/* These are the same depends as the test function x509_crs_check_opaque(),
+ * the only function using PSA here. Using a weaker condition would result in
+ * warnings about the static functions defined in psa_crypto_helpers.h being
+ * unused. */
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
+    defined(MBEDTLS_PEM_WRITE_C) && \
+    defined(MBEDTLS_X509_CSR_WRITE_C)
 #include "psa/crypto.h"
 #include "mbedtls/psa_util.h"
 #include "test/psa_crypto_helpers.h"
@@ -17,7 +23,7 @@
  * MBEDTLS_USE_PSA_CRYPTO. */
 #define PSA_INIT( ) ( (void) 0 )
 #define PSA_DONE( ) ( (void) 0 )
-#endif
+#endif /* MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_PEM_WRITE_C && MBEDTLS_X509_CSR_WRITE_C */
 
 #if defined(MBEDTLS_RSA_C)
 int mbedtls_rsa_decrypt_func( void *ctx, int mode, size_t *olen,