diff --git a/programs/x509/req_app.c b/programs/x509/req_app.c
index b1fc98c..b447c6a 100644
--- a/programs/x509/req_app.c
+++ b/programs/x509/req_app.c
@@ -136,7 +136,9 @@
 
 exit:
     mbedtls_x509_csr_free(&csr);
+#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");