diff --git a/camera_calibration/src/camera_calibration/camera_calibrator.py b/camera_calibration/src/camera_calibration/camera_calibrator.py
index 09a231aaa..f4b284162 100755
--- a/camera_calibration/src/camera_calibration/camera_calibrator.py
+++ b/camera_calibration/src/camera_calibration/camera_calibrator.py
@@ -181,7 +181,7 @@ def handle_monocular(self, msg):
                                         max_chessboard_speed = self._max_chessboard_speed)
             else:
                 self.c = MonoCalibrator(self._boards, self._calib_flags, self._fisheye_calib_flags, self._pattern,
-                                        checkerboard_flags=self.checkerboard_flags,
+                                        checkerboard_flags=self._checkerboard_flags,
                                         max_chessboard_speed = self._max_chessboard_speed)
 
         # This should just call the MonoCalibrator