diff --git a/runners/dictionary/dictionarymatchengine.h b/runners/dictionary/dictionarymatchengine.h
--- a/runners/dictionary/dictionarymatchengine.h
+++ b/runners/dictionary/dictionarymatchengine.h
@@ -37,6 +37,7 @@
 private Q_SLOTS:
     void dataUpdated(const QString &name, const Plasma::DataEngine::Data &data);
     void sourceAdded(const QString &source);
+    void sourceRemoved(const QString &source);
 
 };
 
diff --git a/runners/dictionary/dictionarymatchengine.cpp b/runners/dictionary/dictionarymatchengine.cpp
--- a/runners/dictionary/dictionarymatchengine.cpp
+++ b/runners/dictionary/dictionarymatchengine.cpp
@@ -43,6 +43,7 @@
         qDebug() << "The dictionary data engine timed out (word:" << word << ")";
     locker.unlock();
 
+    QMetaObject::invokeMethod(this, "sourceRemoved", Qt::QueuedConnection, Q_ARG(const QString&, word));
     // after a timeout, if dataUpdated gets m_wordLock here, it can lock data->mutex successfully.
 
     m_wordLock.lockForWrite();
@@ -60,6 +61,11 @@
     m_dictionaryEngine->connectSource(source, this);
 }
 
+void DictionaryMatchEngine::sourceRemoved(const QString &source)
+{
+    m_dictionaryEngine->disconnectSource(source, this);
+}
+
 void DictionaryMatchEngine::dataUpdated(const QString &source, const Plasma::DataEngine::Data &result)
 {
     if (!result.contains(QLatin1String("text")))