diff --git a/launcher/java/JavaChecker.cpp b/launcher/java/JavaChecker.cpp
index 678c98cd4..c54a5b04b 100644
--- a/launcher/java/JavaChecker.cpp
+++ b/launcher/java/JavaChecker.cpp
@@ -41,6 +41,7 @@
 #include <QProcess>
 
 #include "Commandline.h"
+#include "FileSystem.h"
 #include "java/JavaUtils.h"
 
 JavaChecker::JavaChecker(QString path, QString args, int minMem, int maxMem, int permGen, int id, QObject* parent)