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-rw-r--r--ace/Proactor.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ace/Proactor.h b/ace/Proactor.h
index 229f4470e7d..dcfffa492e3 100644
--- a/ace/Proactor.h
+++ b/ace/Proactor.h
@@ -16,7 +16,7 @@
//
// ============================================================================
-#ifndef ACE_PROACTOR_H
+#if !defined (ACE_PROACTOR_H)
#define ACE_PROACTOR_H
#include "ace/OS.h"