diff --git a/IDE/Renesas/e2studio/RX72N/include/user_settings.h b/IDE/Renesas/e2studio/RX72N/include/user_settings.h
index 3dece404..658b389b 100644
--- a/IDE/Renesas/e2studio/RX72N/include/user_settings.h
+++ b/IDE/Renesas/e2studio/RX72N/include/user_settings.h
@@ -27,7 +27,7 @@
 #define H_USER_SETTINGS_
 
 /* For TSIP use, please enable the following line. */
-#define WOLFBOOT_RENESAS_TSIP
+/* #define WOLFBOOT_RENESAS_TSIP */
 /* For TSIP SRC version use, please enable the following line */
 /* #define WOLFBOOT_RENESAS_TSIP_SRCVERSION */
 
@@ -183,6 +183,9 @@
 #       define WOLFSSL_SP_NO_4096
 #   endif
 #   define WC_ASN_HASH_SHA256
+#   if defined(WOLFBOOT_RENESAS_TSIP)
+#       define ENCRYPTED_KEY_BYTE_SIZE RSA2048_PUB_SIZE
+#   endif
 #endif
 
 #ifdef WOLFBOOT_SIGN_RSA3072
diff --git a/hal/renesas-rx.c b/hal/renesas-rx.c
index 5285ed90..5fb16fb6 100644
--- a/hal/renesas-rx.c
+++ b/hal/renesas-rx.c
@@ -99,7 +99,7 @@ void hal_init(void)
                             (byte*)&encrypted_user_key_data->encrypted_user_key,
                             0/* dummy */);
     /* TSIP specific RSA public key */
-    if (tsip_use_PublicKey_buffer(&pkInfo,
+    if (tsip_use_PublicKey_buffer_crypt(&pkInfo,
                 (const char*)&encrypted_user_key_data->encrypted_user_key,
                  RSA2048_PUB_SIZE,
                  tsip_key_type) != 0) {