diff --git a/src/compiler/compile/render_dom/wrappers/Element/index.ts b/src/compiler/compile/render_dom/wrappers/Element/index.ts
index 09b9f4aaa6..eeb537b9db 100644
--- a/src/compiler/compile/render_dom/wrappers/Element/index.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/index.ts
@@ -709,20 +709,20 @@ export default class ElementWrapper extends Wrapper {
 		`);
 
 		binding_group.events.forEach(name => {
-			if (name.startsWith('elementresize')) {
+			const resizeListenerFunctions = {
+				"elementresize": "add_iframe_resize_listener",
+				"elementresizeobservecontentrect": "add_content_rect_observer",
+				"elementresizeobservecontentbox": "add_content_box_observer",
+				"elementresizeobserveborderbox": "add_border_box_observer",
+				"elementresizeobservedevicepixelcontentbox": "add_device_pixel_content_box_observer",
+			};
+
+			if (name in resizeListenerFunctions) {
 				const resize_listener = block.get_unique_name(`${this.var.name}_resize_listener`);
 				block.add_variable(resize_listener);
 
-				const functionName = ({
-					"elementresize": "add_iframe_resize_listener",
-					"elementresizeobservecontentrect": "add_content_rect_observer",
-					"elementresizeobservecontentbox": "add_content_box_observer",
-					"elementresizeobserveborderbox": "add_border_box_observer",
-					"elementresizeobservedevicepixelcontentbox": "add_device_pixel_content_box_observer",
-				})[name];
-
 				block.chunks.mount.push(
-					b`${resize_listener} = @${functionName}(${this.var}, ${callee}.bind(${this.var}));`
+					b`${resize_listener} = @${resizeListenerFunctions[name]}(${this.var}, ${callee}.bind(${this.var}));`
 				);
 
 				block.chunks.destroy.push(