diff --git a/cosmic-settings/src/pages/display/mod.rs b/cosmic-settings/src/pages/display/mod.rs
index 23e810a..c54f01d 100644
--- a/cosmic-settings/src/pages/display/mod.rs
+++ b/cosmic-settings/src/pages/display/mod.rs
@@ -398,6 +398,7 @@ impl page::Page<crate::pages::Message> for Page {
                 enabled: true,
                 make: None,
                 model: "Test 1".into(),
+                serial_number: "Serial 1".into(),
                 mirroring: None,
                 physical: (1, 1),
                 position: (0, 0),
@@ -415,6 +416,7 @@ impl page::Page<crate::pages::Message> for Page {
                 enabled: true,
                 make: None,
                 model: "Test 1".into(),
+                serial_number: "Serial 2".into(),
                 mirroring: None,
                 physical: (1, 1),
                 position: (1920, 0),