diff --git a/base/shell/explorer/traywnd.cpp b/base/shell/explorer/traywnd.cpp
index b27a4689fe..5facb653a5 100644
--- a/base/shell/explorer/traywnd.cpp
+++ b/base/shell/explorer/traywnd.cpp
@@ -1625,6 +1625,10 @@ ChangePos:
                 StartSize.cy = HIWORD(size);
             }
         }
+        else
+        {
+            StartSize.cy = rcClient.bottom - rcClient.top;
+        }
 
         if (m_StartButton.m_hWnd != NULL)
         {