diff --git a/src/index.ts b/src/index.ts
index b2164250..bba7dd9c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -60,9 +60,13 @@ export const failures: <T>(errors: Errors) => Validation<T> = left
  * @category Decode error
  * @since 1.0.0
  */
-export const failure = <T>(value: unknown, context: Context, message?: string): Validation<T> =>
+export let failure = <T>(value: unknown, context: Context, message?: string): Validation<T> =>
   failures([{ value, context, message }])
 
+export const setFailureImplementation = (impl: (value: unknown, context: Context, message?: string) => Validation<unknown>): void => {
+  failure = (impl as any)
+}
+
 /**
  * @category Decode error
  * @since 1.0.0