diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 13381c1566..50c8d57a11 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -1446,7 +1446,7 @@ declare module "zlib" {
     }
 
     export interface ZlibParams {
-        params(level: number, strategy: number, callback?: () => void): void;
+        params(level: number, strategy: number, callback: () => void): void;
     }
 
     export interface ZlibReset {