diff --git a/lib/FT_2018_STW_CAN/FT_2018_STW_CAN.cpp b/lib/FT_2018_STW_CAN/FT_2018_STW_CAN.cpp
index 39df85c..312095e 100644
--- a/lib/FT_2018_STW_CAN/FT_2018_STW_CAN.cpp
+++ b/lib/FT_2018_STW_CAN/FT_2018_STW_CAN.cpp
@@ -109,7 +109,7 @@ void Receive_Can_0(CAN_FRAME *temp_message) {
   }
   case CAN_ID_MS4_IGN_REV_ATH: { // rpm
     Vehicle_data.revol =
-        (temp_message->data.byte[5] | temp_message->data.byte[4] << 8);
+        (temp_message->data.byte[4] | temp_message->data.byte[3] << 8);
     break;
   }
   case CAN_ID_MS4_SPEED: { // speed