diff --git a/extensions-builtin/mobile/javascript/mobile.js b/extensions-builtin/mobile/javascript/mobile.js
index 1b835a519..652f07ac7 100644
--- a/extensions-builtin/mobile/javascript/mobile.js
+++ b/extensions-builtin/mobile/javascript/mobile.js
@@ -26,3 +26,7 @@ function reportWindowSize() {
 }
 
 window.addEventListener("resize", reportWindowSize);
+
+onUiLoaded(function() {
+    reportWindowSize();
+});