diff --git a/src/browser/Terminal.ts b/src/browser/Terminal.ts
index 1f436c8c10..017633b4f6 100644
--- a/src/browser/Terminal.ts
+++ b/src/browser/Terminal.ts
@@ -703,10 +703,13 @@ export class Terminal extends CoreTerminal implements ITerminal {
           but = ev.button < 3 ? ev.button : CoreMouseButton.NONE;
           break;
         case 'wheel':
-          // only UP/DOWN wheel events are respected
-          if ((ev as WheelEvent).deltaY !== 0) {
-            action = (ev as WheelEvent).deltaY < 0 ? CoreMouseAction.UP : CoreMouseAction.DOWN;
+          const amount = self.viewport!.getLinesScrolled(ev as WheelEvent);
+
+          if (amount === 0) {
+            return false;
           }
+
+          action = (ev as WheelEvent).deltaY < 0 ? CoreMouseAction.UP : CoreMouseAction.DOWN;
           but = CoreMouseButton.WHEEL;
           break;
         default: