diff --git a/base/shell/explorer-new/trayntfy.cpp b/base/shell/explorer-new/trayntfy.cpp
index 189b46f4e06..8e06d495196 100644
--- a/base/shell/explorer-new/trayntfy.cpp
+++ b/base/shell/explorer-new/trayntfy.cpp
@@ -120,7 +120,7 @@ public:
 class CNotifyToolbar :
     public CToolbar<NOTIFYICONDATA>
 {
-    const int ICON_SIZE = 16;
+    static const int ICON_SIZE = 16;
 
     HIMAGELIST SysIcons;
     int VisibleButtonCount;