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-rw-r--r--ace/config-aix-4.2.x.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ace/config-aix-4.2.x.h b/ace/config-aix-4.2.x.h
index da4be30107e..eaffcd8bbf3 100644
--- a/ace/config-aix-4.2.x.h
+++ b/ace/config-aix-4.2.x.h
@@ -5,7 +5,7 @@
// platforms running AIX 4.2.x using the IBM C++ compiler (xlC) or
// g++/egcs.
-#if !defined (ACE_CONFIG_H)
+#ifndef ACE_CONFIG_H
#define ACE_CONFIG_H
#if defined (__xlC__)