diff --git a/src/routes/profile.js b/src/routes/profile.js
index 4882b7b04..720bb08ae 100644
--- a/src/routes/profile.js
+++ b/src/routes/profile.js
@@ -121,6 +121,7 @@ async function getAvatar(req, res, next) {
     const [error, avatar] = await safe(users.getAvatar(req.params.identifier));
     if (error) return next(BoxError.toHttpError(error));
 
+    res.set('Content-Type', 'image/png');
     res.send(avatar);
 }