diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index 19a855b..a52584a 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -66,6 +66,15 @@
     mbedtls_ctr_drbg_init(&ctr_drbg);
     mbedtls_pk_init(&pk);
 
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_status_t status = psa_crypto_init();
+    if (status != PSA_SUCCESS) {
+        mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
+                        (int) status);
+        goto exit;
+    }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
     if (argc != 3) {
         mbedtls_printf("usage: mbedtls_pk_sign <key_file> <filename>\n");
 
@@ -141,6 +150,7 @@
     mbedtls_pk_free(&pk);
     mbedtls_ctr_drbg_free(&ctr_drbg);
     mbedtls_entropy_free(&entropy);
+    mbedtls_psa_crypto_free();
 
 #if defined(MBEDTLS_ERROR_C)
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {