Fix build break

diff --git a/src/mscorlib/src/System/Diagnostics/Debug.Windows.cs b/src/mscorlib/src/System/Diagnostics/Debug.Windows.cs
index 095e9b698574e88e896275a4588f64241ddca022..483bf510151e87c0939f73259c6627b8f7a8c146 100644 (file)
--- a/src/mscorlib/src/System/Diagnostics/Debug.Windows.cs
+++ b/src/mscorlib/src/System/Diagnostics/Debug.Windows.cs
@@ -22,6 +22,8 @@ namespace System.Diagnostics
             }
         }
 
+        private static readonly object s_ForLock = new Object();
+
         private static void WriteCore(string message)
         {
             // really huge messages mess up both VS and dbmon, so we chop it up into