[corlib] Fixes warning

diff --git a/mcs/class/referencesource/mscorlib/system/io/filesystemenumerable.cs b/mcs/class/referencesource/mscorlib/system/io/filesystemenumerable.cs
index 3f088037db0d72e2bcc714a53d2573a4650dee0e..4889350563bc8e5c557a8fb0d21e81041d876748 100644 (file)
--- a/mcs/class/referencesource/mscorlib/system/io/filesystemenumerable.cs
+++ b/mcs/class/referencesource/mscorlib/system/io/filesystemenumerable.cs
@@ -186,7 +186,9 @@ namespace System.IO
         private SearchOption searchOption;
         private String fullPath;
         private String normalizedSearchPath;
+#if !MONO        
         private int oldMode;
+#endif
         private bool _checkHost;
 
         [System.Security.SecuritySafeCritical]