diff --git a/lib/src/processor/memory/mmio/apu/channels.rs b/lib/src/processor/memory/mmio/apu/channels.rs
index fea2095..7d2ecd3 100644
--- a/lib/src/processor/memory/mmio/apu/channels.rs
+++ b/lib/src/processor/memory/mmio/apu/channels.rs
@@ -217,7 +217,7 @@ impl PwmChannel {
 
     pub(super) fn length_tick(&mut self) {
         if self.length_enable {
-            self.length_timer += 1;
+            self.length_timer = self.length_timer.saturating_add(1);
             if self.length_timer >= 64 {
                 self.enabled = false;
             }
@@ -502,7 +502,7 @@ impl Lfsr {
     }
 
     fn tick(&mut self) {
-        self.timer += 1;
+        self.timer = self.timer.saturating_add(1);
         if self.timer > self.interval {
             self.timer = 0;
             self.next_value();
@@ -598,7 +598,7 @@ impl NoiseChannel {
 
     pub(super) fn length_tick(&mut self) {
         if self.length_enable {
-            self.length_timer += 1;
+            self.length_timer = self.length_timer.saturating_add(1);
             if self.length_timer >= 64 {
                 self.enabled = false;
             }