diff --git a/src/file/indexerstate.h b/src/file/indexerstate.h
--- a/src/file/indexerstate.h
+++ b/src/file/indexerstate.h
@@ -22,10 +22,13 @@
 #ifndef BALOO_INDEXER_STATE_H
 #define BALOO_INDEXER_STATE_H
 
+#include <QObject>
 #include <QString>
 #include <KLocalizedString>
 
 namespace Baloo {
+Q_NAMESPACE
+
 enum IndexerState {
         Idle,
         Suspended,
@@ -38,6 +41,7 @@
         StaleIndexEntriesClean,
         LowPowerIdle,
 };
+Q_ENUM_NS(IndexerState)
 
 inline QString stateString(IndexerState state)
 {
diff --git a/src/qml/experimental/CMakeLists.txt b/src/qml/experimental/CMakeLists.txt
--- a/src/qml/experimental/CMakeLists.txt
+++ b/src/qml/experimental/CMakeLists.txt
@@ -15,6 +15,8 @@
     ${DBUS_INTERFACES}
 )
 
+qt5_wrap_cpp(baloomonitorplugin_SRCS ../../file/indexerstate.h)
+
 add_library(baloomonitorplugin SHARED ${baloomonitorplugin_SRCS})
 add_dependencies(baloomonitorplugin BalooDBusInterfaces)
 
diff --git a/src/qml/experimental/baloomonitorplugin.cpp b/src/qml/experimental/baloomonitorplugin.cpp
--- a/src/qml/experimental/baloomonitorplugin.cpp
+++ b/src/qml/experimental/baloomonitorplugin.cpp
@@ -19,13 +19,14 @@
 
 #include "baloomonitorplugin.h"
 #include "monitor.h"
+#include "indexerstate.h"
 
 #include <QtQml>
 
 void BalooMonitorPlugin::registerTypes(const char *uri)
 {
     Q_ASSERT(uri == QLatin1String("org.kde.baloo.experimental"));
 
     qmlRegisterType<Baloo::Monitor>(uri, 0, 1, "Monitor");
+    qmlRegisterUncreatableMetaObject(Baloo::staticMetaObject, uri, 0, 1, "Baloo", "Error: only enums");
 }
-
diff --git a/src/qml/experimental/monitor.h b/src/qml/experimental/monitor.h
--- a/src/qml/experimental/monitor.h
+++ b/src/qml/experimental/monitor.h
@@ -42,16 +42,16 @@
     Q_PROPERTY(uint filesIndexed MEMBER m_filesIndexed NOTIFY newFileIndexed)
     Q_PROPERTY(QString remainingTime READ remainingTime NOTIFY remainingTimeChanged)
     Q_PROPERTY(QString stateString READ stateString NOTIFY indexerStateChanged)
-    Q_PROPERTY(int state READ state NOTIFY indexerStateChanged)
+    Q_PROPERTY(Baloo::IndexerState state READ state NOTIFY indexerStateChanged)
 public:
     explicit Monitor(QObject* parent = nullptr);
 
     // Property readers
     QString filePath() const { return m_filePath; }
     QString suspendState() const;
     QString remainingTime() const { return m_remainingTime; }
     QString stateString() const { return Baloo::stateString(m_indexerState); }
-    int state() const { return static_cast<int>(m_indexerState); }
+    Baloo::IndexerState state() const { return m_indexerState; }
 
     // Invokable methods
     Q_INVOKABLE void toggleSuspendState();