diff --git a/src/components/Splitpanes.vue b/src/components/Splitpanes.vue
index c61e163..e3d05c6 100644
--- a/src/components/Splitpanes.vue
+++ b/src/components/Splitpanes.vue
@@ -161,7 +161,7 @@ export default {
     onMouseMove (event) {
       event.preventDefault()
       this.dragging = true
-      this.$set(this.movableSplitter, 'visibility', 'visible')
+      this.movableSplitter.visibility = 'visible'
       this.moveSplitter(event)
     },
 
@@ -195,7 +195,7 @@ export default {
       }
       const offset = splitter.calculateOffset(event, splitterInfo)
       const dir = this.horizontal ? 'top' : 'left'
-      this.$set(this.movableSplitter, dir, offset)
+      this.movableSplitter[dir] = offset
     },
 
     togglePane (pane) {
diff --git a/src/mixins/tooltips.js b/src/mixins/tooltips.js
index 4090e84..c211413 100644
--- a/src/mixins/tooltips.js
+++ b/src/mixins/tooltips.js
@@ -8,12 +8,12 @@ export default {
   },
   methods: {
     showTooltip (e) {
-      this.$set(this.tooltipStyle, 'top', e.clientY - 12 + 'px')
-      this.$set(this.tooltipStyle, 'left', e.clientX + 12 + 'px')
-      this.$set(this.tooltipStyle, 'visibility', 'visible')
+      this.tooltipStyle.top = e.clientY - 12 + 'px'
+      this.tooltipStyle.left = e.clientX + 12 + 'px'
+      this.tooltipStyle.visibility = 'visible'
     },
     hideTooltip () {
-      this.$set(this.tooltipStyle, 'visibility', 'hidden')
+      this.tooltipStyle.visibility = 'hidden'
     }
   }
 }