diff --git a/packages/primevue/src/knob/Knob.d.ts b/packages/primevue/src/knob/Knob.d.ts
index 29dc85fd6..e8627103b 100644
--- a/packages/primevue/src/knob/Knob.d.ts
+++ b/packages/primevue/src/knob/Knob.d.ts
@@ -191,7 +191,7 @@ export interface KnobProps {
      * Template string of the value.
      * @defaultValue '{value}'
      */
-    valueTemplate?: (val: number) => string | string | undefined;
+    valueTemplate?: ((val: number) => string) | string | undefined;
     /**
      * Index of the element in tabbing order.
      * @defaultValue 0