diff --git a/src/damaris/gui/DamarisGUI.py b/src/damaris/gui/DamarisGUI.py
index 2a18551..86bf9b5 100644
--- a/src/damaris/gui/DamarisGUI.py
+++ b/src/damaris/gui/DamarisGUI.py
@@ -1347,7 +1347,7 @@ class LogWindow:
         self.textview.connect( "key-press-event", self.textview_keypress)
         apply_font_css(self.textview, "Monospace 10")
         self.textbuffer = self.textview.get_buffer( )
-        self.lock = threading.Lock( )
+        self.lock = threading.RLock( )
         self.last_timetag = None
         self( "Started in directory %s\n" % os.getcwd( ) )