diff --git a/src/core/ArgumentParser.cpp b/src/core/ArgumentParser.cpp
index 4a579a46c..dc6a0a56c 100644
--- a/src/core/ArgumentParser.cpp
+++ b/src/core/ArgumentParser.cpp
@@ -17,7 +17,7 @@
 
 #include "ArgumentParser.h"
 
-QStringList ArgumentParser::argumentKeys = QStringList() << "password" << "config" << "filename";
+const QStringList ArgumentParser::argumentKeys = QStringList() << "password" << "config" << "filename";
 
 QHash<QString, QString> ArgumentParser::parseArguments(const QStringList& args)
 {
diff --git a/src/core/ArgumentParser.h b/src/core/ArgumentParser.h
index a9dac52a4..1e6473fce 100644
--- a/src/core/ArgumentParser.h
+++ b/src/core/ArgumentParser.h
@@ -29,7 +29,7 @@ class ArgumentParser
 public:
     static QHash<QString, QString> parseArguments(const QStringList& args);
 private:
-    static QStringList argumentKeys;
+    static const QStringList argumentKeys;
     static void parseOption(int& i, QHash<QString, QString>& argumentMap, const QStringList& args);
 };