diff --git a/pm_icecon/nt/params/nsidc0001.py b/pm_icecon/nt/params/nsidc0001.py
index f8e0a41..a3cfde2 100644
--- a/pm_icecon/nt/params/nsidc0001.py
+++ b/pm_icecon/nt/params/nsidc0001.py
@@ -15,7 +15,7 @@
 def get_0001_nt_params(
     *,
     hemisphere: Hemisphere,
-    platform: ValidSatellites,
+    platform: ValidSatellites | str,
 ) -> NasateamParams:
     nt_tiepoints = get_tiepoints(satellite=platform, hemisphere=hemisphere)
 
diff --git a/pm_icecon/nt/tiepoints.py b/pm_icecon/nt/tiepoints.py
index 521c6d2..dee765c 100644
--- a/pm_icecon/nt/tiepoints.py
+++ b/pm_icecon/nt/tiepoints.py
@@ -217,7 +217,7 @@ class TiePoints(TypedDict):
 
 def get_tiepoints(
     *,
-    satellite: ValidSatellites,
+    satellite: ValidSatellites | str,
     hemisphere: Hemisphere,
 ) -> NasateamTiePoints:
     """Given a satellite and hemisphere, return pre-defined tiepoints."""