diff --git a/typescript/option/src/helpers.ts b/typescript/option/src/helpers.ts
index b248d65..fb87ce1 100644
--- a/typescript/option/src/helpers.ts
+++ b/typescript/option/src/helpers.ts
@@ -75,7 +75,7 @@ export const get = <T>(option: Option<T>) => {
 }
 
 export const iter = <T>(mapper: Mapper<T, void>, option: Option<T>) => {
-    match(option, mapper, () => {})
+    return match(option, mapper, always(None))
 }
 
 export const toArray = <T>(option: Option<T>) => {