diff --git a/src/main.rs b/src/main.rs
index 2feec1e..fd4e74c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -39,7 +39,7 @@ pub struct AdcPins(
 impl adc::SetChannels<AdcPins> for adc::Adc<ADC1>
 {
     fn set_samples(&mut self) {
-        for ch in 0..(CONTROL_CNT + 1) as u8 {
+        for ch in 0..(CONTROL_CNT - 1) as u8 {
             self.set_channel_sample_time(ch, adc::SampleTime::T_28);
         }
     }