diff --git a/projects/rtmpose3d/rtmpose3d/simcc_3d_label.py b/projects/rtmpose3d/rtmpose3d/simcc_3d_label.py
index 22e42079c8..db2de60e92 100644
--- a/projects/rtmpose3d/rtmpose3d/simcc_3d_label.py
+++ b/projects/rtmpose3d/rtmpose3d/simcc_3d_label.py
@@ -210,7 +210,7 @@ def _generate_gaussian(
         self,
         keypoints: np.ndarray,
         keypoints_visible: Optional[np.ndarray] = None
-    ) -> tuple[ndarray, ndarray, ndarray, ndarray]:
+    ) -> Tuple[ndarray, ndarray, ndarray, ndarray]:
         """Encoding keypoints into SimCC labels with Gaussian Label Smoothing
         strategy."""