diff --git a/tools/core_mod.d.ts b/tools/core_mod.d.ts
index 0292474413..ef6d335c93 100644
--- a/tools/core_mod.d.ts
+++ b/tools/core_mod.d.ts
@@ -4,12 +4,6 @@
 // deno-lint-ignore no-explicit-any
 export const core: any;
 
-// deno-lint-ignore no-explicit-any
-type UncurryThis<T extends (this: any, ...args: any[]) => any> = (
-  self: ThisParameterType<T>,
-  ...args: Parameters<T>
-) => ReturnType<T>;
-
 export const primordials: typeof __bootstrap.primordials;
 
 // deno-lint-ignore no-explicit-any