diff --git a/mytetra/src/qtsingleapplication/qtlocalpeer.cpp b/mytetra/src/qtsingleapplication/qtlocalpeer.cpp
index f531956..4efc760 100644
--- a/mytetra/src/qtsingleapplication/qtlocalpeer.cpp
+++ b/mytetra/src/qtsingleapplication/qtlocalpeer.cpp
@@ -44,6 +44,7 @@
 ** 
 ****************************************************************************/
 
+#include <unistd.h>
 
 #include "qtlocalpeer.h"
 #include <QtCore/QCoreApplication>