diff --git a/imagescrollareagl.cpp b/imagescrollareagl.cpp
index 1d07c2d..e9b8188 100644
--- a/imagescrollareagl.cpp
+++ b/imagescrollareagl.cpp
@@ -46,6 +46,7 @@ ImageWidget::ImageWidget(QWidget *parent) : QOpenGLWidget(parent)
     m_blockRepaint = false;
     m_range = UINT16_MAX;
     m_imgWidth = m_imgHeight = -1;
+    m_stretch = 0;
 }
 
 ImageWidget::~ImageWidget()