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-rw-r--r--ace/Object_Manager.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ace/Object_Manager.h b/ace/Object_Manager.h
index 4eaeb652b69..12e771145ba 100644
--- a/ace/Object_Manager.h
+++ b/ace/Object_Manager.h
@@ -23,6 +23,7 @@
class ACE_Mutex;
class ACE_Null_Mutex;
class ACE_Thread_Mutex;
+ class ACE_Mutex;
class ACE_Recursive_Thread_Mutex;
class ACE_RW_Thread_Mutex;
#endif /* ACE_MT_SAFE */