diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index e9f97b7..3b03efd 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -1041,7 +1041,7 @@ void ImageViewer::generateControlPanels() {
   task_tab5_scrolllayout->addWidget(t_high_spinbox);
   task_tab5_scrolllayout->addWidget(run_canny_edge_third_step);
   task_tab5_scrolllayout->addWidget(run_canny_edge);
-  task_tab5_scrolllayout->addWidget(new QLabel(" --- Unsharp masking --- ");
+  task_tab5_scrolllayout->addWidget(new QLabel(" --- Unsharp masking --- "));
   task_tab5_scrolllayout->addWidget(new QLabel("Sharpening factor alpha"));
   task_tab5_scrolllayout->addWidget(usm_sharpening);
   task_tab5_scrolllayout->addWidget(new QLabel("Gauss filter width sigma"));