diff --git a/apps/opencs/view/render/cameracontroller.cpp b/apps/opencs/view/render/cameracontroller.cpp
index 7f8f9013c..85301bb62 100644
--- a/apps/opencs/view/render/cameracontroller.cpp
+++ b/apps/opencs/view/render/cameracontroller.cpp
@@ -108,6 +108,7 @@ namespace CSVRender
     {
         mLockUpright = true;
         mUp = up;
+        setModified();
     }
 
     void FreeCameraController::unfixUpAxis()