diff --git a/extensions/tsconfig.base.json b/extensions/tsconfig.base.json
index e142bde5317..2e4a6009a02 100644
--- a/extensions/tsconfig.base.json
+++ b/extensions/tsconfig.base.json
@@ -23,7 +23,7 @@
 			"ES2020.Intl",
 			"ES2021.Promise",
 			"ES2021.String",
-			"ES2021.Weakref"
+			"ES2021.WeakRef"
 		],
 		"module": "commonjs",
 		"strict": true,
diff --git a/src/tsconfig.base.json b/src/tsconfig.base.json
index 5659f50db62..a309a50adaa 100644
--- a/src/tsconfig.base.json
+++ b/src/tsconfig.base.json
@@ -39,7 +39,7 @@
 			"ES2020.Intl",
 			"ES2021.Promise",
 			"ES2021.String",
-			"ES2021.Weakref",
+			"ES2021.WeakRef",
 			"DOM",
 			"DOM.Iterable",
 			"WebWorker.ImportScripts"