diff --git a/chirp/drivers/btech.py b/chirp/drivers/btech.py
index 5068beed..84bce4d0 100644
--- a/chirp/drivers/btech.py
+++ b/chirp/drivers/btech.py
@@ -3513,8 +3513,8 @@ struct {
   u8 unknown0:4,
      scode:4;
   u8 unknown1:2,
-     spmute:1,
-     unknown2:3,
+     spmute:2,
+     unknown2:2,
      optsig:2;
   u8 unknown3:3,
      scramble:1,