diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index f7cf712..bf46799 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -726,6 +726,7 @@
     mbedtls_mpi_free(&serial);
     mbedtls_ctr_drbg_free(&ctr_drbg);
     mbedtls_entropy_free(&entropy);
+    mbedtls_psa_crypto_free();
 
 #if defined(_WIN32)
     mbedtls_printf("  + Press Enter to exit this program.\n");