diff --git a/src/CLSharedMemory.cpp b/src/CLSharedMemory.cpp
index 9a37eb1..5fb96f3 100644
--- a/src/CLSharedMemory.cpp
+++ b/src/CLSharedMemory.cpp
@@ -5,6 +5,7 @@
 #include <fcntl.h>
 #include <string>
 #include <errno.h>
+#include <unistd.h>
 #include "CLSharedMemory.h"
 #include "CLLogger.h"
 #include "CLCriticalSection.h"
@@ -101,4 +102,4 @@ int CLSharedMemory::GetRefCount()
 	}
 
 	return buf.shm_nattch;
-}
\ No newline at end of file
+}