diff --git a/src/rqt_plot/data_plot/mat_data_plot.py b/src/rqt_plot/data_plot/mat_data_plot.py
index 2959a46..9962bbc 100644
--- a/src/rqt_plot/data_plot/mat_data_plot.py
+++ b/src/rqt_plot/data_plot/mat_data_plot.py
@@ -134,6 +134,7 @@ def __init__(self, parent=None):
         vbox.addWidget(self._toolbar)
         vbox.addWidget(self._canvas)
         self.setLayout(vbox)
+        self.setMinimumSize(self.layout().minimumSize().width() + 1, self.layout().minimumSize().height() + 1 )
 
         self._curves = {}
         self._current_vline = None