diff --git a/src/lib/util/basic/either.ts b/src/lib/util/basic/either.ts
index a2b372e..e75d5d5 100644
--- a/src/lib/util/basic/either.ts
+++ b/src/lib/util/basic/either.ts
@@ -22,7 +22,7 @@ export const eitherChain =
     fa._tag === 'Right' ? f(fa.right) : fa
 
 export const fold =
-  <A, B, E>(onLeft: (e: E) => B, onRight: (a: A) => B) =>
+  <A, E, B>(onLeft: (e: E) => B, onRight: (a: A) => B) =>
   (fa: Either<A, E>): B =>
     fa._tag === 'Left' ? onLeft(fa.left) : onRight(fa.right)