diff --git a/src/monocoque/devices/serial/moza.c b/src/monocoque/devices/serial/moza.c
index 69ca53a..87ceec6 100644
--- a/src/monocoque/devices/serial/moza.c
+++ b/src/monocoque/devices/serial/moza.c
@@ -23,7 +23,7 @@ unsigned char moza_checksum(unsigned char *data)
         ret += data[i];
     }
 
-    return 0;
+    return ret;
 }
 
 int moza_update(SerialDevice* serialdevice, unsigned short maxrpm, unsigned short rpm)