diff --git a/PPOCRLabel/libs/canvas.py b/PPOCRLabel/libs/canvas.py
index 81f37995126140b03650f5ddea37ea282d5ceb09..44d899cbc9f21793f89c498cf844c95e418b08a1 100644
--- a/PPOCRLabel/libs/canvas.py
+++ b/PPOCRLabel/libs/canvas.py
@@ -611,8 +611,8 @@ class Canvas(QWidget):
 
         if self.drawing() and not self.prevPoint.isNull() and not self.outOfPixmap(self.prevPoint):
             p.setPen(QColor(0, 0, 0))
-            p.drawLine(self.prevPoint.x(), 0, self.prevPoint.x(), self.pixmap.height())
-            p.drawLine(0, self.prevPoint.y(), self.pixmap.width(), self.prevPoint.y())
+            p.drawLine(int(self.prevPoint.x()), 0, int(self.prevPoint.x()), self.pixmap.height())
+            p.drawLine(0, int(self.prevPoint.y()), self.pixmap.width(), int(self.prevPoint.y()))
 
         self.setAutoFillBackground(True)
         if self.verified:
@@ -909,4 +909,4 @@ class Canvas(QWidget):
     def updateShapeIndex(self):
         for i in range(len(self.shapes)):
             self.shapes[i].idx = i
-        self.update()
\ No newline at end of file
+        self.update()