diff --git a/include/minigui.h b/include/minigui.h
index b745c223..a9ec81aa 100644
--- a/include/minigui.h
+++ b/include/minigui.h
@@ -1600,7 +1600,7 @@ typedef struct _CompositorOps {
      * a main window with the extended style WS_EX_AUTOPOSITION.
      */
     void (*calc_mainwin_pos) (CompositorCtxt* ctxt, MG_Layer* layer,
-            DWORD zt_type, int first_for_type, CALCPOSINFO* info);
+            DWORD zt_type, int first_for_type, CALCPOSINFO* info, int cli);
 
     /**
      * This operation will be called when there was a layer operation.
diff --git a/src/kernel/compsor-fallback.c b/src/kernel/compsor-fallback.c
index da22d5a1..73d64586 100644
--- a/src/kernel/compsor-fallback.c
+++ b/src/kernel/compsor-fallback.c
@@ -532,7 +532,7 @@ static void rebuild_wins_region (CompositorCtxt* ctxt)
 }
 
 static void calc_mainwin_pos (CompositorCtxt* ctxt, MG_Layer* layer,
-            DWORD zt_type, int first_for_type, CALCPOSINFO* info)
+            DWORD zt_type, int first_for_type, CALCPOSINFO* info, int cli)
 {
     /* give a default size first */
     if (IsRectEmpty (&info->rc)) {
diff --git a/src/kernel/desktop.c b/src/kernel/desktop.c
index f79a16f0..45339b0d 100644
--- a/src/kernel/desktop.c
+++ b/src/kernel/desktop.c
@@ -4410,7 +4410,7 @@ static int dskCalculateDefaultPosition (int cli, CALCPOSINFO* info)
 
 #ifdef _MGSCHEMA_COMPOSITING   /* not defined _MGSCHEMA_COMPOSITING */
     DO_COMPSOR_OP_ARGS (calc_mainwin_pos,
-            __mg_get_layer_from_zi(zi), zt_type, first, info);
+            __mg_get_layer_from_zi(zi), zt_type, first, info, cli);
 #else   /* defined _MGSCHEMA_COMPOSITING */
     /* give a default size first */
     if (IsRectEmpty (&info->rc)) {