diff --git a/src/components/Output/custom-els/PinchZoom/index.ts b/src/components/Output/custom-els/PinchZoom/index.ts
index 1e50fe13..48f1a033 100644
--- a/src/components/Output/custom-els/PinchZoom/index.ts
+++ b/src/components/Output/custom-els/PinchZoom/index.ts
@@ -242,7 +242,7 @@ export default class PinchZoom extends HTMLElement {
   /**
    * Update transform values without checking bounds. This is only called in setTransform.
    */
-  _updateTransform(scale: number, x: number, y: number, allowChangeEvent: boolean) {
+  private _updateTransform(scale: number, x: number, y: number, allowChangeEvent: boolean) {
     // Avoid scaling to zero
     if (scale < MIN_SCALE) return;