diff --git a/src/ui/manager.cpp b/src/ui/manager.cpp
index b4969d0f6..1aea164ea 100644
--- a/src/ui/manager.cpp
+++ b/src/ui/manager.cpp
@@ -1778,8 +1778,8 @@ void Manager::onInitTheme(InitThemeEvent& ev)
         gfx::Rect bounds = window->bounds();
         bounds *= newUIScale;
         bounds /= oldUIScale;
-        bounds.x = std::clamp(bounds.x, 0, displaySize.w - bounds.w);
-        bounds.y = std::clamp(bounds.y, 0, displaySize.h - bounds.h);
+        bounds.x = std::clamp(bounds.x, 0, std::max(0, displaySize.w - bounds.w));
+        bounds.y = std::clamp(bounds.y, 0, std::max(0, displaySize.h - bounds.h));
         window->setBounds(bounds);
       }
     }