diff --git a/win/vncviewer/DesktopWindow.cxx b/win/vncviewer/DesktopWindow.cxx
index 296be66..e282a28 100644
--- a/win/vncviewer/DesktopWindow.cxx
+++ b/win/vncviewer/DesktopWindow.cxx
@@ -111,7 +111,7 @@
   }
 }
 
-DesktopWindowClass baseClass;
+static DesktopWindowClass baseClass;
 
 //
 // -=- FrameClass