diff --git a/components/lib/config/PrimeVue.d.ts b/components/lib/config/PrimeVue.d.ts
index 0838a0b33..178295e11 100644
--- a/components/lib/config/PrimeVue.d.ts
+++ b/components/lib/config/PrimeVue.d.ts
@@ -222,7 +222,7 @@ export interface PrimeVuePTOptions {
         animate?: AnimateOnScrollDirectivePassThroughOptions;
     };
     global?: {
-        css?: (options: any) => string | string | undefined;
+        css?: ((options: any) => string | undefined) | string | undefined;
     };
 }