diff --git a/tachometer_v1.ino b/tachometer_v1.ino
index 70ea905..63e3b1e 100644
--- a/tachometer_v1.ino
+++ b/tachometer_v1.ino
@@ -106,15 +106,6 @@ void ai0() {
   if (digitalRead(ENCODER_CLK) == digitalRead(ENCODER_DT)) {
     counter++;
   }
-}
-
-// Interrupt service routine for encoder channel B
-void ai1() {
-  // If both signals are different, the encoder is rotating forward
-  if (digitalRead(ENCODER_CLK) != digitalRead(ENCODER_DT)) {
-    counter++;
-  }
-}
 
 }