diff --git a/examples/petstore-v2.ts b/examples/petstore-v2.ts
index 944102b..a851cc2 100644
--- a/examples/petstore-v2.ts
+++ b/examples/petstore-v2.ts
@@ -148,7 +148,7 @@ export class ApiClient {
 
   store = {
     getInventory: () => {
-      return this.Fetch<object>("get", "/store/inventory", {})
+      return this.Fetch<Record<string, number>>("get", "/store/inventory", {})
     },
 
     placeOrder: (body: Order) => {
diff --git a/examples/petstore-v3.ts b/examples/petstore-v3.ts
index 7c61e94..3fafa61 100644
--- a/examples/petstore-v3.ts
+++ b/examples/petstore-v3.ts
@@ -141,7 +141,7 @@ export class ApiClient {
 
   store = {
     getInventory: () => {
-      return this.Fetch<object>("get", "/store/inventory", {})
+      return this.Fetch<Record<string, number>>("get", "/store/inventory", {})
     },
 
     placeOrder: (body: Order) => {
diff --git a/src/type-gen.ts b/src/type-gen.ts
index 31d8a66..fccdf56 100644
--- a/src/type-gen.ts
+++ b/src/type-gen.ts
@@ -1,6 +1,6 @@
 import { Oas3Schema, Referenced } from "@redocly/openapi-core/lib/typings/openapi"
 import { filterEmpty } from "array-utils-ts"
-import { isArray, uniq, upperFirst } from "lodash-es"
+import { isArray, isBoolean, uniq, upperFirst } from "lodash-es"
 import ts from "typescript"
 import { Context } from "./config"
 import { OAS3, unref } from "./schema"
@@ -68,6 +68,19 @@ const makeInlineEnum = (s: OAS3) => {
   return undefined
 }
 
+const makeObject = (ctx: Context, s: OAS3): ts.TypeNode => {
+  if (s.type !== "object") throw new Error(`makeObject: not an object ${JSON.stringify(s)}`)
+
+  if (s.additionalProperties && !isBoolean(s.additionalProperties)) {
+    return f.createTypeReferenceNode("Record", [
+      f.createKeywordTypeNode(ts.SyntaxKind.StringKeyword),
+      makeType(ctx, s.additionalProperties),
+    ])
+  }
+
+  return f.createKeywordTypeNode(ts.SyntaxKind.ObjectKeyword)
+}
+
 export const makeType = (ctx: Context, s?: Referenced<OAS3>): ts.TypeNode => {
   const mk = makeType.bind(null, ctx)
 
@@ -123,7 +136,7 @@ export const makeType = (ctx: Context, s?: Referenced<OAS3>): ts.TypeNode => {
 
     let t: ts.TypeNode
     // if (s.type === "object") t = f.createKeywordTypeNode(ts.SyntaxKind.UnknownKeyword)
-    if (s.type === "object") t = f.createKeywordTypeNode(ts.SyntaxKind.ObjectKeyword)
+    if (s.type === "object") t = makeObject(ctx, s)
     else if (s.type === "boolean") t = f.createKeywordTypeNode(ts.SyntaxKind.BooleanKeyword)
     else if (s.type === "number") t = f.createKeywordTypeNode(ts.SyntaxKind.NumberKeyword)
     else if (s.type === "string") t = f.createKeywordTypeNode(ts.SyntaxKind.StringKeyword)
diff --git a/test/type-gen.test.ts b/test/type-gen.test.ts
index 7c06b71..59a3e3f 100644
--- a/test/type-gen.test.ts
+++ b/test/type-gen.test.ts
@@ -117,6 +117,19 @@ test("type inline", async () => {
     { type: "object", properties: { a: { type: "string" } }, additionalProperties: true },
     "{ a?: string }",
   )
+
+  t({ type: "object", additionalProperties: { type: "number" } }, "Record<string, number>")
+
+  t(
+    {
+      type: "object",
+      additionalProperties: {
+        type: "array",
+        items: { oneOf: [{ type: "string" }, { type: "number" }] },
+      },
+    },
+    "Record<string, (string | number)[]>",
+  )
 })
 
 test("type alias", async () => {