diff --git a/src/original/element/scroll-left.ts b/src/original/element/scroll-left.ts
index aa8fafc..f4e53d6 100644
--- a/src/original/element/scroll-left.ts
+++ b/src/original/element/scroll-left.ts
@@ -1,5 +1,5 @@
 import {UNSUPPORTED_ENVIRONMENT} from "../../support/unsupported-environment";
 
-export const ELEMENT_ORIGINAL_SCROLL_LEFT_SET_DESCRIPTOR = UNSUPPORTED_ENVIRONMENT
-	? undefined
-	: Object.getOwnPropertyDescriptor(Element.prototype, "scrollLeft")!.set!;
+const s = Object.getOwnPropertyDescriptor(Element.prototype, "scrollTop");
+
+export const ELEMENT_ORIGINAL_SCROLL_LEFT_SET_DESCRIPTOR = UNSUPPORTED_ENVIRONMENT || typeof s === "undefined" ? undefined : s!.set!;
diff --git a/src/original/element/scroll-top.ts b/src/original/element/scroll-top.ts
index 87d406e..a084f34 100644
--- a/src/original/element/scroll-top.ts
+++ b/src/original/element/scroll-top.ts
@@ -1,5 +1,4 @@
 import {UNSUPPORTED_ENVIRONMENT} from "../../support/unsupported-environment";
 
-export const ELEMENT_ORIGINAL_SCROLL_TOP_SET_DESCRIPTOR = UNSUPPORTED_ENVIRONMENT
-	? undefined
-	: Object.getOwnPropertyDescriptor(Element.prototype, "scrollTop")!.set!;
+const s = Object.getOwnPropertyDescriptor(Element.prototype, "scrollTop");
+export const ELEMENT_ORIGINAL_SCROLL_TOP_SET_DESCRIPTOR = UNSUPPORTED_ENVIRONMENT || typeof s === "undefined" ? undefined : s!.set!;