diff --git a/src/interconnect.rs b/src/interconnect.rs
index a614d9b..aee15f7 100644
--- a/src/interconnect.rs
+++ b/src/interconnect.rs
@@ -131,8 +131,8 @@ impl Interconnect {
 
     // Somehow we need different timers for this.
     pub fn tick(&mut self, cycles: u8) {
-        self.display.tick(cycles as u16 * 4);
-        self.timer.tick(cycles as u16 * 4);
+        self.display.tick(cycles as u16);
+        self.timer.tick(cycles as u16);
 
         if self.display.vblank_interrupt() {
             self.interrupt_request_flags |= INTERRUPT_DISPLAY_VBLANK;