diff --git a/lib/CodeGen/LiveDebugVariables.cpp b/lib/CodeGen/LiveDebugVariables.cpp
index c1f7e0e..3dfe4c0 100644
--- a/lib/CodeGen/LiveDebugVariables.cpp
+++ b/lib/CodeGen/LiveDebugVariables.cpp
@@ -71,6 +71,7 @@
 /// LocMap - Map of where a user value is live, and its location.
 typedef IntervalMap<SlotIndex, unsigned, 4> LocMap;
 
+namespace {
 /// UserValueScopes - Keeps track of lexical scopes associated with an
 /// user value's source location.
 class UserValueScopes {
@@ -91,6 +92,7 @@
     return false;
   }
 };
+} // end anonymous namespace
 
 /// UserValue - A user value is a part of a debug info user variable.
 ///