diff --git a/lib/cartodb/api/middlewares/check-static-image-format.js b/lib/cartodb/api/middlewares/check-static-image-format.js
index d72fcb81..9b9c8b24 100644
--- a/lib/cartodb/api/middlewares/check-static-image-format.js
+++ b/lib/cartodb/api/middlewares/check-static-image-format.js
@@ -1,8 +1,8 @@
-const VALID_IMAGE_FORMATS = ['png', 'jpg', 'jpeg'];
+const VALID_IMAGE_FORMATS = ['png', 'jpg'];
 
 module.exports = function checkStaticImageFormat () {
     return function checkStaticImageFormatMiddleware (req, res, next) {
-        if(!VALID_IMAGE_FORMATS.includes(req.params.format.toLowerCase())) {
+        if(!VALID_IMAGE_FORMATS.includes(req.params.format)) {
             return next(new Error(`Unsupported image format "${req.params.format}"`));
         }