diff --git a/src/api/details.ts b/src/api/details.ts
index 8a9e5ad..f5787c9 100644
--- a/src/api/details.ts
+++ b/src/api/details.ts
@@ -3,6 +3,9 @@ import { getDetailsUrl } from './settings';
 async function fetchDetails(url: string) {
   const res = await fetch(`${process.env.apiHost}${url}`, {
     next: { revalidate: 60 * 60 },
+    headers: {
+      Accept: 'application/json',
+    },
   });
   if (res.status < 200 || res.status > 299) {
     throw new Error('Failed to fetch data');
diff --git a/src/api/observations.ts b/src/api/observations.ts
index e140159..e1dd678 100644
--- a/src/api/observations.ts
+++ b/src/api/observations.ts
@@ -16,6 +16,9 @@ async function fetchObservation() {
     `${process.env.apiHost}/api/portal/fr/${process.env.portal}/contributions/json_schema/`,
     {
       next: { revalidate: 60 * 60 },
+      headers: {
+        Accept: 'application/json',
+      },
     },
   );
   if (res.status < 200 || res.status > 299) {
diff --git a/src/api/page.ts b/src/api/page.ts
index 1303c8d..b726609 100644
--- a/src/api/page.ts
+++ b/src/api/page.ts
@@ -3,6 +3,9 @@ import { Menu, getMenuSettings } from './settings';
 async function fetchDetails(url: string) {
   const res = await fetch(`${process.env.apiHost}${url}`, {
     next: { revalidate: 60 * 60 },
+    headers: {
+      Accept: 'application/json',
+    },
   });
   if (res.status < 200 || res.status > 299) {
     throw new Error('Failed to fetch data');
diff --git a/src/api/poi.ts b/src/api/poi.ts
index 32fbf71..e0b13e9 100644
--- a/src/api/poi.ts
+++ b/src/api/poi.ts
@@ -20,6 +20,9 @@ async function fetchPois({ params }: FetchPoisProps = {}): Promise<Poi[]> {
   const url = `${process.env.apiHost}/api/portal/fr/${process.env.portal}/pois/`;
   const urlWithParams = [url, params].filter(Boolean).join('?');
   const res = await fetch(urlWithParams, {
+    headers: {
+      Accept: 'application/json',
+    },
     next: { revalidate: 60 * 60 },
   });
   if (res.status < 200 || res.status > 299) {
diff --git a/src/api/settings.ts b/src/api/settings.ts
index d5fb879..e8eccbb 100644
--- a/src/api/settings.ts
+++ b/src/api/settings.ts
@@ -155,6 +155,9 @@ export async function fetchSettings(): Promise<RawSettings> {
       `${process.env.apiHost}/api/portal/fr/portal/${process.env.portal}/`,
       {
         next: { revalidate: 60 * 60 },
+        headers: {
+          Accept: 'application/json',
+        },
       },
     ).catch(error => {
       throw error;