diff --git a/include/wx/generic/private/grid.h b/include/wx/generic/private/grid.h
index 318e88293b..1161b79337 100644
--- a/include/wx/generic/private/grid.h
+++ b/include/wx/generic/private/grid.h
@@ -343,7 +343,7 @@ public:
     {
     }
 
-    virtual bool IsFrozen() const { return true; }
+    virtual bool IsFrozen() const wxOVERRIDE { return true; }
 };
 
 
@@ -375,7 +375,7 @@ public:
     {
     }
 
-    virtual bool IsFrozen() const { return true; }
+    virtual bool IsFrozen() const wxOVERRIDE { return true; }
 };