diff --git a/src/processor/mod.rs b/src/processor/mod.rs
index 94b99c7..7dfd81d 100644
--- a/src/processor/mod.rs
+++ b/src/processor/mod.rs
@@ -64,7 +64,7 @@ impl CPU {
     }
 
     fn increment_timers(&mut self, cycles: u8) {
-        let secs = (cycles * 4) as f64 / (CLOCK_SPEED * SPEEDUP);
+        let secs = (cycles * 4) as f64 / CLOCK_SPEED;
 
         self.vblank_timer += secs;
         if self.vblank_remaining > 0 {
@@ -94,7 +94,7 @@ impl CPU {
                 self.memory.set(0xFF05, val);
             }
         }
-        spin_sleep::sleep(Duration::from_secs_f64(secs));
+        spin_sleep::sleep(Duration::from_secs_f64(secs / SPEEDUP));
     }
 
     fn next_opcode(&mut self) -> u8 {