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-rw-r--r--ace/Map_Manager.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ace/Map_Manager.h b/ace/Map_Manager.h
index acd447d45eb..ffcc9c1219b 100644
--- a/ace/Map_Manager.h
+++ b/ace/Map_Manager.h
@@ -404,7 +404,7 @@ protected:
ACE_Allocator *allocator_;
/// Synchronization variable for the MT_SAFE <ACE_Map_Manager>.
- ACE_LOCK lock_;
+ mutable ACE_LOCK lock_;
/// Implement the Map as a resizeable array of <ACE_Map_Entry>.
ACE_Map_Entry<EXT_ID, INT_ID> *search_structure_;