diff --git a/controller/controller.ino b/controller/controller.ino
index 9d63c9d..609df0e 100644
--- a/controller/controller.ino
+++ b/controller/controller.ino
@@ -198,7 +198,7 @@ typedef struct{
    int16_t  boardTemp;
    int16_t  curL_DC;
    int16_t  curR_DC;
-   int16_t  checksum;
+   uint16_t  checksum;
 } SerialFeedback;
 SerialFeedback Feedback;
 SerialFeedback NewFeedback;