diff --git a/typings/mysql/lib/Connection.d.ts b/typings/mysql/lib/Connection.d.ts
index 2dabd960fc..6af95e1f7d 100644
--- a/typings/mysql/lib/Connection.d.ts
+++ b/typings/mysql/lib/Connection.d.ts
@@ -183,7 +183,7 @@ export interface ConnectionOptions {
    *
    * You can also specify a function to do the type casting yourself:
    * ```ts
-   * (field: Field, next: () => void) => {
+   * (field: Field, next: () => unknown) => {
    *   return next();
    * }
    * ```
diff --git a/typings/mysql/lib/parsers/typeCast.d.ts b/typings/mysql/lib/parsers/typeCast.d.ts
index b8e975148b..7d62b983ad 100644
--- a/typings/mysql/lib/parsers/typeCast.d.ts
+++ b/typings/mysql/lib/parsers/typeCast.d.ts
@@ -49,6 +49,6 @@ export type Field = Type & {
   geometry: () => Geometry | Geometry[] | null;
 };
 
-export type Next = () => void;
+export type Next = () => unknown;
 
 export type TypeCast = ((field: Field, next: Next) => any) | boolean;
diff --git a/typings/mysql/lib/protocol/sequences/Query.d.ts b/typings/mysql/lib/protocol/sequences/Query.d.ts
index 44d6c910c9..34da54c23c 100644
--- a/typings/mysql/lib/protocol/sequences/Query.d.ts
+++ b/typings/mysql/lib/protocol/sequences/Query.d.ts
@@ -44,7 +44,7 @@ export interface QueryOptions {
    *
    * You can also specify a function to do the type casting yourself:
    * ```ts
-   * (field: Field, next: () => void) => {
+   * (field: Field, next: () => unknown) => {
    *   return next();
    * }
    * ```