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-rw-r--r--ace/Timer_Queue_Adapters.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/ace/Timer_Queue_Adapters.h b/ace/Timer_Queue_Adapters.h
index 17053e8b456..e02fb262af6 100644
--- a/ace/Timer_Queue_Adapters.h
+++ b/ace/Timer_Queue_Adapters.h
@@ -24,6 +24,11 @@
#include "ace/Signal.h"
#include "ace/Condition_Recursive_Thread_Mutex.h"
+#if defined (ACE_HAS_DEFERRED_TIMER_COMMANDS)
+# include "ace/Unbounded_Queue.h"
+class ACE_Command_Base;
+#endif /* ACE_HAS_DEFERRED_TIMER_COMMANDS */
+
/**
* @class ACE_Async_Timer_Queue_Adapter
*