diff --git a/src/tools/valgrindfake/outputgenerator.cpp b/src/tools/valgrindfake/outputgenerator.cpp
index 9b3e6f8d0cf..73ca2f72dee 100644
--- a/src/tools/valgrindfake/outputgenerator.cpp
+++ b/src/tools/valgrindfake/outputgenerator.cpp
@@ -41,6 +41,8 @@
 #include <QStringList>
 #include <QDebug>
 
+#include <unistd.h>
+
 using namespace Valgrind::Fake;
 
 OutputGenerator::OutputGenerator(QAbstractSocket *output, QIODevice *input) :