diff --git a/.changeset/small-pens-knock.md b/.changeset/small-pens-knock.md
new file mode 100644
index 000000000000..dde86fc0cced
--- /dev/null
+++ b/.changeset/small-pens-knock.md
@@ -0,0 +1,6 @@
+---
+'@astrojs/markdoc': patch
+'@astrojs/mdx': patch
+---
+
+Fix integration return type
diff --git a/packages/integrations/markdoc/src/index.ts b/packages/integrations/markdoc/src/index.ts
index 8543cf260593..71e117de4829 100644
--- a/packages/integrations/markdoc/src/index.ts
+++ b/packages/integrations/markdoc/src/index.ts
@@ -11,24 +11,19 @@ import {
 	prependForwardSlash,
 } from './utils.js';
 
-type IntegrationWithPrivateHooks = {
-	name: string;
-	hooks: Omit<AstroIntegration['hooks'], 'astro:config:setup'> & {
-		'astro:config:setup': (
-			params: HookParameters<'astro:config:setup'> & {
-				// `contentEntryType` is not a public API
-				// Add type defs here
-				addContentEntryType: (contentEntryType: ContentEntryType) => void;
-			}
-		) => void | Promise<void>;
-	};
+type SetupHookParams = HookParameters<'astro:config:setup'> & {
+	// `contentEntryType` is not a public API
+	// Add type defs here
+	addContentEntryType: (contentEntryType: ContentEntryType) => void;
 };
 
-export default function markdoc(markdocConfig: Config = {}): IntegrationWithPrivateHooks {
+export default function markdoc(markdocConfig: Config = {}): AstroIntegration {
 	return {
 		name: '@astrojs/markdoc',
 		hooks: {
-			'astro:config:setup': async ({ updateConfig, config, addContentEntryType }) => {
+			'astro:config:setup': async (params) => {
+				const { updateConfig, config, addContentEntryType } = params as SetupHookParams;
+
 				function getEntryInfo({ fileUrl, contents }: { fileUrl: URL; contents: string }) {
 					const parsed = parseFrontmatter(contents, fileURLToPath(fileUrl));
 					return {
diff --git a/packages/integrations/mdx/src/index.ts b/packages/integrations/mdx/src/index.ts
index 1e64f5afa44b..bcbb0a47d63d 100644
--- a/packages/integrations/mdx/src/index.ts
+++ b/packages/integrations/mdx/src/index.ts
@@ -23,33 +23,21 @@ export type MdxOptions = Omit<typeof markdownConfigDefaults, 'remarkPlugins' | '
 	remarkRehype: RemarkRehypeOptions;
 };
 
-type IntegrationWithPrivateHooks = {
-	name: string;
-	hooks: Omit<AstroIntegration['hooks'], 'astro:config:setup'> & {
-		'astro:config:setup': (
-			params: HookParameters<'astro:config:setup'> & {
-				// `addPageExtension` and `contentEntryType` are not a public APIs
-				// Add type defs here
-				addPageExtension: (extension: string) => void;
-				addContentEntryType: (contentEntryType: ContentEntryType) => void;
-			}
-		) => void | Promise<void>;
-	};
+type SetupHookParams = HookParameters<'astro:config:setup'> & {
+	// `addPageExtension` and `contentEntryType` are not a public APIs
+	// Add type defs here
+	addPageExtension: (extension: string) => void;
+	addContentEntryType: (contentEntryType: ContentEntryType) => void;
 };
 
-export default function mdx(
-	partialMdxOptions: Partial<MdxOptions> = {}
-): IntegrationWithPrivateHooks {
+export default function mdx(partialMdxOptions: Partial<MdxOptions> = {}): AstroIntegration {
 	return {
 		name: '@astrojs/mdx',
 		hooks: {
-			'astro:config:setup': async ({
-				updateConfig,
-				config,
-				addPageExtension,
-				addContentEntryType,
-				command,
-			}) => {
+			'astro:config:setup': async (params) => {
+				const { updateConfig, config, addPageExtension, addContentEntryType, command } =
+					params as SetupHookParams;
+
 				addPageExtension('.mdx');
 				addContentEntryType({
 					extensions: ['.mdx'],