diff --git a/main_x11.cpp b/main_x11.cpp
index d426313ea2..30c131e1c8 100644
--- a/main_x11.cpp
+++ b/main_x11.cpp
@@ -298,6 +298,7 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
     KWin::SessionManager weAreIndeed;
 #endif
     KWin::SessionSaveDoneHelper helper;
-
+    Q_UNUSED(helper); // The sessionsavedonehelper opens a side channel to the smserver,
+                      // listens for events and talks to it, so it needs to be created.
     return a.exec();
 }