diff --git a/types/jump.js/index.d.ts b/types/jump.js/index.d.ts
index 5c811d8656..6c7a0e9d7d 100644
--- a/types/jump.js/index.d.ts
+++ b/types/jump.js/index.d.ts
@@ -10,7 +10,7 @@ declare function jump(target: string | Element | number, opts?: jump.Options): v
 declare namespace jump {
     type TransitionFunc = (t: number, b: number, c: number, d: number) => number;
     interface Options {
-        duration?: number;
+        duration?: number | ((distance: number) => number);
         offset?: number;
         callback?(): void;
         easing?: TransitionFunc;
diff --git a/types/jump.js/jump.js-tests.ts b/types/jump.js/jump.js-tests.ts
index bce5d68f21..1f2d67deaf 100644
--- a/types/jump.js/jump.js-tests.ts
+++ b/types/jump.js/jump.js-tests.ts
@@ -6,6 +6,9 @@ jump('.target');
 jump('.target', {
   duration: 1000,
 });
+jump('.target', {
+  duration: distance => Math.abs(distance)
+});
 jump('.target', {
   duration: 200,
   offset: 10