diff --git a/packages/core/src/admin-ui/context.tsx b/packages/core/src/admin-ui/context.tsx
index 218c0b5a53a..d786add79d5 100644
--- a/packages/core/src/admin-ui/context.tsx
+++ b/packages/core/src/admin-ui/context.tsx
@@ -88,7 +88,10 @@ export const KeystoneProvider = (props: KeystoneProviderProps) => {
     () =>
       new ApolloClient({
         cache: new InMemoryCache(),
-        link: createUploadLink({ uri: props.apiPath }),
+        link: createUploadLink({
+          uri: props.apiPath,
+          headers: { 'Apollo-Require-Preflight': 'true' },
+        }),
       }),
     [props.apiPath]
   );