diff --git a/include/dbus-c++/eventloop-integration.h b/include/dbus-c++/eventloop-integration.h

index 1b0302e..3e44304 100644

--- a/include/dbus-c++/eventloop-integration.h

+++ b/include/dbus-c++/eventloop-integration.h

@@ -26,6 +26,7 @@

 #define __DBUSXX_EVENTLOOP_INTEGRATION_H

 #include <errno.h>

+#include <unistd.h>

 #include "api.h"

 #include "dispatcher.h"

 #include "util.h"