diff --git a/src/pages/api/posts.ts b/src/pages/api/posts.ts
index ef5a45ab..1307cf53 100644
--- a/src/pages/api/posts.ts
+++ b/src/pages/api/posts.ts
@@ -3,5 +3,7 @@ import { getAllPostsForSearch } from '@lib/astro'
 
 export const GET: APIRoute = async () => {
   const allPosts = await getAllPostsForSearch()
-  return new Response(JSON.stringify(allPosts))
+  return new Response(JSON.stringify(allPosts), {
+    headers: { 'content-type': 'application/json' }
+  })
 }
diff --git a/src/pages/feed.json.ts b/src/pages/feed.json.ts
index ca7454db..c6533f31 100644
--- a/src/pages/feed.json.ts
+++ b/src/pages/feed.json.ts
@@ -45,6 +45,9 @@ export async function GET(context: AstroConfig) {
         }
       ],
       items
-    })
+    }),
+    {
+      headers: { 'content-type': 'application/json' }
+    }
   )
 }
diff --git a/src/pages/manifest.json.ts b/src/pages/manifest.json.ts
index df9a8df3..7d2d2827 100644
--- a/src/pages/manifest.json.ts
+++ b/src/pages/manifest.json.ts
@@ -33,5 +33,7 @@ export const GET: APIRoute = async () => {
     icons
   }
 
-  return new Response(JSON.stringify(manifest))
+  return new Response(JSON.stringify(manifest), {
+    headers: { 'content-type': 'application/json' }
+  })
 }