diff --git a/types/ramda/index.d.ts b/types/ramda/index.d.ts
index 153d78fe22..2f3beec69e 100644
--- a/types/ramda/index.d.ts
+++ b/types/ramda/index.d.ts
@@ -242,8 +242,8 @@ export function call(fn: (...args: readonly any[]) => (...args: readonly any[])
  * `chain` maps a function over a list and concatenates the results.
  * This implementation is compatible with the Fantasy-land Chain spec
  */
-export function chain<T, U>(fn: (n: T) => U[], list: readonly T[]): U[];
-export function chain<T, U>(fn: (n: T) => U[]): (list: readonly T[]) => U[];
+export function chain<T, U>(fn: (n: T) => readonly U[], list: readonly T[]): U[];
+export function chain<T, U>(fn: (n: T) => readonly U[]): (list: readonly T[]) => U[];
 export function chain<X0, X1, R>(fn: (x0: X0, x1: X1) => R, fn1: (x1: X1) => X0): (x1: X1) => R;
 
 /**
diff --git a/types/ramda/test/chain-tests.ts b/types/ramda/test/chain-tests.ts
index 4f7635fd13..d97b8e494a 100644
--- a/types/ramda/test/chain-tests.ts
+++ b/types/ramda/test/chain-tests.ts
@@ -5,10 +5,24 @@ import * as R from 'ramda';
     return [n, n];
   }
 
+  function duplicateConst(n: number) {
+    return [n, n] as const;
+  }
+
+  function duplicateReadonly(n: number): ReadonlyArray<number> {
+    return [n, n];
+  }
+
   R.chain(duplicate, [1, 2, 3]); // => [1, 1, 2, 2, 3, 3]
   R.chain(duplicate)([1, 2, 3]); // => [1, 1, 2, 2, 3, 3]
   const result1: number[] = R.chain<number, number[], number[]>(
     R.append,
     R.head,
   )([1, 2, 3]); // => [1, 2, 3, 1]
+
+  R.chain(duplicateConst, [1, 2, 3] as const); // => [1, 1, 2, 2, 3, 3]
+  R.chain(duplicateConst)([1, 2, 3] as const); // => [1, 1, 2, 2, 3, 3]
+
+  R.chain(duplicateReadonly, [1, 2, 3]); // => [1, 1, 2, 2, 3, 3]
+  R.chain(duplicateReadonly)([1, 2, 3]); // => [1, 1, 2, 2, 3, 3]
 };