diff --git a/graphs/gui/ctrlPanel.py b/graphs/gui/ctrlPanel.py
index 2b1875942..60c1f2f6d 100644
--- a/graphs/gui/ctrlPanel.py
+++ b/graphs/gui/ctrlPanel.py
@@ -284,11 +284,13 @@ class GraphControlPanel(wx.Panel):
 
     def OnYTypeUpdate(self, event):
         event.Skip()
+        self.graphFrame.resetXMark()
         self.graphFrame.draw()
 
     def OnXTypeUpdate(self, event):
         event.Skip()
         self._updateInputs()
+        self.graphFrame.resetXMark()
         self.graphFrame.Layout()
         self.graphFrame.UpdateWindowSize()
         self.graphFrame.draw()
diff --git a/graphs/gui/frame.py b/graphs/gui/frame.py
index 07c0b6f20..303bf21b1 100644
--- a/graphs/gui/frame.py
+++ b/graphs/gui/frame.py
@@ -175,6 +175,7 @@ class GraphFrame(AuxiliaryFrame):
         view = self.getView()
         GraphSettings.getInstance().set('selectedGraph', view.internalName)
         self.clearCache(reason=GraphCacheCleanupReason.graphSwitched)
+        self.resetXMark()
         self.ctrlPanel.updateControls()
         self.draw()
         event.Skip()
@@ -198,3 +199,6 @@ class GraphFrame(AuxiliaryFrame):
 
     def draw(self):
         self.canvasPanel.draw()
+
+    def resetXMark(self):
+        self.canvasPanel.xMark = None