diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index bf46799..02ff836 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -726,7 +726,9 @@
     mbedtls_mpi_free(&serial);
     mbedtls_ctr_drbg_free(&ctr_drbg);
     mbedtls_entropy_free(&entropy);
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
     mbedtls_psa_crypto_free();
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
 #if defined(_WIN32)
     mbedtls_printf("  + Press Enter to exit this program.\n");