diff --git a/src/gnatss/posfilter/__init__.py b/src/gnatss/posfilter/__init__.py
index 42ae6a7..4ae5df8 100644
--- a/src/gnatss/posfilter/__init__.py
+++ b/src/gnatss/posfilter/__init__.py
@@ -2,4 +2,4 @@
 
 from .posfilter import kalman_filtering, rotation, spline_interpolate
 
-__all__ = ["kalman_filtering", "spline_interpolate", "rotation"]
+__all__ = ["kalman_filtering", "rotation", "spline_interpolate"]