diff --git a/avrdude.conf.in b/avrdude.conf.in
index 004bf385..9d8976a1 100644
--- a/avrdude.conf.in
+++ b/avrdude.conf.in
@@ -4400,8 +4400,8 @@ part
 
     memory "calibration"
         size            = 4;
-        read            = "0 0 1 1  1 0 0 0   0 0 x x  x x x x",
-                          "0 0 0 0  0 0 0 0   o o o o  o o o o";
+        read            = "0 0 1 1  1 0 0 0     0 0 x x  x x x x",
+                          "0 0 0 0  0 0 a1 a0   o o o o  o o o o";
       ;
 
     memory "signature"