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-rw-r--r--ace/Unbounded_Set.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ace/Unbounded_Set.h b/ace/Unbounded_Set.h
index 369dd849198..b185063c6af 100644
--- a/ace/Unbounded_Set.h
+++ b/ace/Unbounded_Set.h
@@ -15,6 +15,7 @@
#include /**/ "ace/pre.h"
#include "ace/Node.h"
+#include "ace/os_include/os_stddef.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once