diff --git a/core/AmCallWatcher.cpp b/core/AmCallWatcher.cpp
index 947399fb..1f60125c 100644
--- a/core/AmCallWatcher.cpp
+++ b/core/AmCallWatcher.cpp
@@ -26,11 +26,13 @@
  */
 
 #include <sys/time.h>
+#include <unistd.h>
 
 #include "log.h"
 
 #include "AmCallWatcher.h"
 
+
 AmCallWatcher::AmCallWatcher() 
   : garbage_collector(new AmCallWatcherGarbageCollector(soft_states_mut, soft_states)),
     AmEventQueue(this)