diff --git a/containments/desktop/plugins/folder/positioner.cpp b/containments/desktop/plugins/folder/positioner.cpp
--- a/containments/desktop/plugins/folder/positioner.cpp
+++ b/containments/desktop/plugins/folder/positioner.cpp
@@ -110,6 +110,8 @@
     if (m_perStripe != perStripe) {
         m_perStripe = perStripe;
 
+        emit perStripeChanged();
+
         if (m_enabled && perStripe > 0 && !m_proxyToSource.isEmpty()) {
             applyPositions();
         }