diff --git a/src/expression_pedal.cpp b/src/expression_pedal.cpp
index b86843d..306eb7b 100644
--- a/src/expression_pedal.cpp
+++ b/src/expression_pedal.cpp
@@ -11,7 +11,7 @@ ExpressionPedal::ExpressionPedal(uint8_t adc_pin)
     , last_read_time(0)
     , current_raw(0)
     , cal_min(36)
-    , cal_max(1239)
+    , cal_max(1220)
 {
 }