diff --git a/components/page/Canvas.vue b/components/page/Canvas.vue
index 9600d4e..b4721cc 100644
--- a/components/page/Canvas.vue
+++ b/components/page/Canvas.vue
@@ -217,6 +217,7 @@ onMounted(() => {
         {
             const dist = distance(e.touches);
             const diff = dist / lastDistance;
+            lastDistance = dist;
             
             zoom.value = clamp(zoom.value * diff, minZoom.value, 3);
         }