diff --git a/test/types/queries.test.ts b/test/types/queries.test.ts
index 23ae0424cb..3f22400fa6 100644
--- a/test/types/queries.test.ts
+++ b/test/types/queries.test.ts
@@ -863,5 +863,5 @@ async function gh15786() {
   }
 
   const schema = new Schema<IDoc, Model<IDoc>, {}, {}, {}, DocStatics>({});
-  schema.static({ m1() {} } as DocStatics);
+  schema.static({ m1() {} });
 }
diff --git a/types/index.d.ts b/types/index.d.ts
index a445427e4c..9f220e0c24 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -622,9 +622,8 @@ declare module 'mongoose' {
     set<K extends keyof SchemaOptions>(key: K, value: SchemaOptions<DocType>[K], _tags?: any): this;
 
     /** Adds static "class" methods to Models compiled from this schema. */
-    static<K extends keyof TStaticMethods>(name: K, fn: TStaticMethods[K]): this;
-    static(obj: { [F in keyof TStaticMethods]: TStaticMethods[F] }): this;
-    static(obj: { [F in keyof TStaticMethods]: TStaticMethods[F] } & { [name: string]: (this: TModelType, ...args: any[]) => any }): this;
+    static<K extends keyof TStaticMethods>(name: K, fn: TStaticMethods[K] & ((this: TModelType, ...args: any[]) => any)): this;
+    static(obj: Partial<TStaticMethods> & { [name: string]: (this: TModelType, ...args: any[]) => any }): this;
     static(name: string, fn: (this: TModelType, ...args: any[]) => any): this;
 
     /** Object of currently defined statics on this schema. */