diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-custom-element/main.svelte b/packages/svelte/tests/runtime-legacy/samples/attribute-casing-custom-element/main.svelte
index 81c855676a..6433d0dc76 100644
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-casing-custom-element/main.svelte
+++ b/packages/svelte/tests/runtime-legacy/samples/attribute-casing-custom-element/main.svelte
@@ -18,9 +18,8 @@
 			this.innerHTML = 'Hello ' + this._obj.text + '!';
 		}
 	}
-	if(!window.customElements.get('my-custom-element')) {
-		window.customElements.define('my-custom-element', MyCustomElement);
-	}
+
+	window.customElements.define('my-custom-element', MyCustomElement);
 </script>
 
 <my-custom-element camelCase={{ text: 'World' }} />
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-custom-element-inheritance/main.svelte b/packages/svelte/tests/runtime-legacy/samples/attribute-custom-element-inheritance/main.svelte
index 04ac58435a..1324bcc4b1 100644
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-custom-element-inheritance/main.svelte
+++ b/packages/svelte/tests/runtime-legacy/samples/attribute-custom-element-inheritance/main.svelte
@@ -26,10 +26,8 @@
 	}
 
 	class Extended extends MyCustomElement {}
-	
-	if(!window.customElements.get('my-custom-inheritance-element')) {
-		window.customElements.define('my-custom-inheritance-element', Extended);
-	}
+
+	window.customElements.define('my-custom-inheritance-element', Extended);
 </script>
 
 <my-custom-inheritance-element camelCase={{ text: 'World' }} text="!" />