diff --git a/packages/strapi-plugin-rest-cache/server/utils/keys/generateHeadersKey.js b/packages/strapi-plugin-rest-cache/server/utils/keys/generateHeadersKey.js
index f98c1dc53..0deeffe44 100644
--- a/packages/strapi-plugin-rest-cache/server/utils/keys/generateHeadersKey.js
+++ b/packages/strapi-plugin-rest-cache/server/utils/keys/generateHeadersKey.js
@@ -2,7 +2,7 @@
 
 function generateHeadersKey(ctx, useHeaders = []) {
   return useHeaders
-    .filter((k) => ctx.request.header[k] !== undefined)
+    .filter((k) => ctx.request.header[k.toLowerCase()] !== undefined)
     .map((k) => `${k.toLowerCase()}=${ctx.request.header[k.toLowerCase()]}`) // headers are key insensitive
     .join(',');
 }