diff --git a/nmapsi4/app/mainwin.h b/nmapsi4/app/mainwin.h
index 89f84e2..ce31cfd 100644
--- a/nmapsi4/app/mainwin.h
+++ b/nmapsi4/app/mainwin.h
@@ -57,6 +57,11 @@
 #include "parser.h"
 #include "vulnerability.h"
 
+// system
+#ifndef Q_WS_WIN
+#include <unistd.h>
+#endif
+
 // define class namespace
 using namespace internalLookup;
 using namespace digInterface;
@@ -71,7 +76,7 @@ namespace Ui
 class nmapClass : public QMainWindow, public Ui::MainWindow
 {
     Q_OBJECT
-    
+
     friend class parser;
     friend class vulnerability;
 
diff --git a/nmapsi4/app/preference/profilemain.h b/nmapsi4/app/preference/profilemain.h
index 1d7049a..3a79b37 100644
--- a/nmapsi4/app/preference/profilemain.h
+++ b/nmapsi4/app/preference/profilemain.h
@@ -29,6 +29,11 @@
 #include "utilities.h"
 #include <ui_profilemain.h>
 
+// system
+#ifndef Q_WS_WIN
+#include <unistd.h>
+#endif
+
 class mainProfile : public QDialog, private Ui::ProfileMain
 {
     Q_OBJECT