diff --git a/src/gui_qt/lib/codeeditor.py b/src/gui_qt/lib/codeeditor.py
index 245a9e1..1b80d4d 100644
--- a/src/gui_qt/lib/codeeditor.py
+++ b/src/gui_qt/lib/codeeditor.py
@@ -237,7 +237,7 @@ class CodeEditor(QtWidgets.QPlainTextEdit):
             if block.isVisible() and (bottom >= evt.rect().top()):
                 number = str(block_number + 1)
                 painter.setPen(QtCore.Qt.black)
-                painter.drawText(0, top, self.current_linenumber.width() - 3, height,
+                painter.drawText(0, int(top), self.current_linenumber.width() - 3, height,
                                  QtCore.Qt.AlignRight, number)
 
             block = block.next()