diff --git a/src/core/preferences.cpp b/src/core/preferences.cpp
index 2f0b690e3..4ede40b1c 100644
--- a/src/core/preferences.cpp
+++ b/src/core/preferences.cpp
@@ -63,6 +63,8 @@ Preferences::Preferences()
     , dirty(false)
     , lock(QReadWriteLock::Recursive)
 {
+    qRegisterMetaTypeStreamOperators<MaxRatioAction>("MaxRatioAction");
+
     QIniSettings *settings = new QIniSettings;
 #ifndef Q_OS_MAC
     QIniSettings *settings_new = new QIniSettings("qBittorrent", "qBittorrent_new");
diff --git a/src/core/types.h b/src/core/types.h
index 92a24d0cf..746fd2f4b 100644
--- a/src/core/types.h
+++ b/src/core/types.h
@@ -30,6 +30,7 @@
 #define TYPES_H
 
 #include <QVariant>
+#include <QDataStream>
 
 const qlonglong MAX_ETA = 8640000;
 
@@ -55,4 +56,19 @@ enum class ShutdownAction
     Hibernate
 };
 
+template<typename T>
+inline QDataStream &operator<<(QDataStream &out, const T &val)
+{
+    return (out << static_cast<int>(val));
+}
+
+template<typename T>
+inline QDataStream &operator>>(QDataStream &in, T &val)
+{
+    int tmp;
+    in >> tmp;
+    val = static_cast<T>(tmp);
+    return in;
+}
+
 #endif // TYPES_H