diff --git a/src/Gui/Quarter/SoQTQuarterAdaptor.cpp b/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
index 15bb0595e4..e5b8fb9030 100644
--- a/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
+++ b/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
@@ -162,6 +162,7 @@ void SIM::Coin3D::Quarter::SoQTQuarterAdaptor::init()
     m_seekperiod = 2.0f;
     m_inseekmode = false;
     m_storedcamera = 0;
+    m_viewingflag = false;
 
     m_seeksensor = new SoTimerSensor(SoQTQuarterAdaptor::seeksensorCB, (void*)this);
     getSoEventManager()->setNavigationState(SoEventManager::NO_NAVIGATION);