diff --git a/project/ui/app.slint b/project/ui/app.slint
index 3c846f2..3506212 100644
--- a/project/ui/app.slint
+++ b/project/ui/app.slint
@@ -75,7 +75,7 @@ export component Prorater inherits Window {
             Button {
                 text: "Calculate";
                 clicked => {
-                    //calculate_msg = on_calculate();
+                    calculate_msg = on_calculate();
                     calculation.show();
                 }
             }