diff --git a/python/gtsam/utils/visual_data_generator.py b/python/gtsam/utils/visual_data_generator.py
index 059b3256d..972f25477 100644
--- a/python/gtsam/utils/visual_data_generator.py
+++ b/python/gtsam/utils/visual_data_generator.py
@@ -36,7 +36,7 @@ class GroundTruth:
         self.cameras = [Pose3()] * nrCameras
         self.points = [Point3(0, 0, 0)] * nrPoints
 
-    def print(self, s: string = "") -> None:
+    def print(self, s: str = "") -> None:
         print(s)
         print("K = ", self.K)
         print("Cameras: ", len(self.cameras))