diff --git a/src/internal/Component.js b/src/internal/Component.js
index 530a48da59..e4be6aed6e 100644
--- a/src/internal/Component.js
+++ b/src/internal/Component.js
@@ -48,7 +48,7 @@ function make_dirty(component, key) {
 	if (!component.$$.dirty) {
 		dirty_components.push(component);
 		schedule_update();
-		component.$$.dirty = {};
+		component.$$.dirty = Object.create(null);
 	}
 	component.$$.dirty[key] = true;
 }
@@ -188,4 +188,4 @@ export class SvelteComponentDev extends SvelteComponent {
 			console.warn(`Component was already destroyed`); // eslint-disable-line no-console
 		};
 	}
-}
\ No newline at end of file
+}