diff --git a/src_features/signMessageEIP712/commands_712.c b/src_features/signMessageEIP712/commands_712.c
index c1d3a56..dc29b3d 100644
--- a/src_features/signMessageEIP712/commands_712.c
+++ b/src_features/signMessageEIP712/commands_712.c
@@ -28,7 +28,9 @@ void handle_eip712_return_code(bool success) {
     } else if (apdu_response_code == APDU_RESPONSE_OK) {  // somehow not set
         apdu_response_code = APDU_RESPONSE_ERROR_NO_INFO;
     }
-    *(uint16_t *) G_io_apdu_buffer = __builtin_bswap16(apdu_response_code);
+
+    G_io_apdu_buffer[0] = (apdu_response_code >> 8) & 0xff;
+    G_io_apdu_buffer[1] = apdu_response_code & 0xff;
 
     // Send back the response, do not restart the event loop
     io_exchange(CHANNEL_APDU | IO_RETURN_AFTER_TX, 2);