diff --git a/cmd/boardvoting/middleware.go b/cmd/boardvoting/middleware.go
index 030883e..5326f05 100644
--- a/cmd/boardvoting/middleware.go
+++ b/cmd/boardvoting/middleware.go
@@ -88,6 +88,8 @@ func (app *application) tryAuthenticate(next http.Handler) http.Handler {
 			return
 		}
 
+		w.Header().Add("Cache-Control", "no-store")
+
 		next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), ctxUser, user)))
 	})
 }