diff --git a/pkg/middleware/middleware.go b/pkg/middleware/middleware.go
index cc0bac28bd3..f87ce728394 100644
--- a/pkg/middleware/middleware.go
+++ b/pkg/middleware/middleware.go
@@ -48,6 +48,7 @@ func AddDefaultResponseHeaders(cfg *setting.Cfg) web.Handler {
 			_, _, resourceURLMatch := t.Match(c.Req.URL.Path)
 			resourceCachable := resourceURLMatch && allowCacheControl(c.Resp)
 			if !strings.HasPrefix(c.Req.URL.Path, "/public/plugins/") &&
+				!strings.HasPrefix(c.Req.URL.Path, "/avatar/") &&
 				!strings.HasPrefix(c.Req.URL.Path, "/api/datasources/proxy/") && !resourceCachable {
 				addNoCacheHeaders(c.Resp)
 			}