diff --git a/src/libtomahawk/query.cpp b/src/libtomahawk/query.cpp
index ca032ae51..1393a3260 100644
--- a/src/libtomahawk/query.cpp
+++ b/src/libtomahawk/query.cpp
@@ -104,6 +104,7 @@ Query::Query( const QString& query, const QID& qid )
 
 Query::~Query()
 {
+    QMutexLocker lock( &m_mutex );
     m_ownRef.clear();
 }