diff --git a/packages/client/src/directives/get-size.ts b/packages/client/src/directives/get-size.ts
index d36699e1a..575b4ce3c 100644
--- a/packages/client/src/directives/get-size.ts
+++ b/packages/client/src/directives/get-size.ts
@@ -33,7 +33,7 @@ function calc(src: Element) {
 }
 
 export default {
-	mounted(src) {
+	mounted(src, binding) {
 		const resize = new ResizeObserver(() => {
 			calc(src);
 		});