diff --git a/src/servers/app/drawing/HWInterface.cpp b/src/servers/app/drawing/HWInterface.cpp
index ffdcfe3bd7..e007645ed9 100644
--- a/src/servers/app/drawing/HWInterface.cpp
+++ b/src/servers/app/drawing/HWInterface.cpp
@@ -20,6 +20,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 
 HWInterfaceListener::HWInterfaceListener()		{}