diff --git a/src/counter.rs b/src/counter.rs
index b2d567b..9d10dbf 100644
--- a/src/counter.rs
+++ b/src/counter.rs
@@ -22,7 +22,7 @@ pub fn pulse_counter(pulses: Arc<AtomicCell<u32>>, last_time: Arc<AtomicCell<Opt
                         let time = f64::from(u32::try_from(now - last).unwrap()) / (60.0 * 60.0 * 1000.0);
                         let watt = 1.0 / time;
                         let avg = power.load();
-                        power.store(avg + (watt-avg)/f64::from(count));
+                        power.store(avg + (watt-avg)/f64::from(count+1));
                     },
                     None => {}
                 }