diff --git a/src/index.tsx b/src/index.tsx
index 7227914..ab9c078 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -123,6 +123,8 @@ class Cropper extends React.Component<Props, State> {
       this.computeSizes()
     } else if (prevProps.zoom !== this.props.zoom) {
       this.recomputeCropPosition()
+    } else if (prevProps.cropSize !== this.props.cropSize) {
+      this.computeSizes()
     }
     if (prevProps.zoomWithScroll !== this.props.zoomWithScroll && this.containerRef) {
       this.props.zoomWithScroll