diff --git a/src/Modal.vue b/src/Modal.vue
index 6ae2a89..f0e34c7 100644
--- a/src/Modal.vue
+++ b/src/Modal.vue
@@ -332,7 +332,7 @@
       },
 
       onWindowResize () {
-        this.window.width = document.body.clientWidth
+        this.window.width = window.innerWidth
         this.window.height = window.innerHeight
       },