diff --git a/GUI/View/Mask/MaskGraphicsScene.cpp b/GUI/View/Mask/MaskGraphicsScene.cpp
index 390417a87d74b93ea1afb1f096268599c6e86017..0c1031bb9d21c7364f768edeb07ab63fec9666fd 100644
--- a/GUI/View/Mask/MaskGraphicsScene.cpp
+++ b/GUI/View/Mask/MaskGraphicsScene.cpp
@@ -361,7 +361,7 @@ void MaskGraphicsScene::updateProxyWidget()
     m_colorMap = new ColorMap; // TODO: potential memory leak
     m_colorMap->itemToMap(m_data2DItem);
     if (m_proxy->widget() != m_colorMap)
-	m_proxy->setWidget(m_colorMap);
+        m_proxy->setWidget(m_colorMap);
     m_adaptor->setColorMapPlot(m_colorMap);
     addItem(m_proxy);
 }