diff --git a/platform/qt/app/mapwindow.cpp b/platform/qt/app/mapwindow.cpp
index 08581835a..8827bea4f 100644
--- a/platform/qt/app/mapwindow.cpp
+++ b/platform/qt/app/mapwindow.cpp
@@ -152,6 +152,8 @@ void MapWindow::resizeGL(int w, int h)
 
 void MapWindow::paintGL()
 {
+    glViewport(0, 0, width(), height());
+
     m_frameDraws++;
     m_map.render();
 }