diff --git a/src/stactools/sentinel2/granule_metadata.py b/src/stactools/sentinel2/granule_metadata.py
index 7c6bc21..c9d8d53 100644
--- a/src/stactools/sentinel2/granule_metadata.py
+++ b/src/stactools/sentinel2/granule_metadata.py
@@ -215,6 +215,10 @@ def platform(self) -> str | None:
             return "sentinel-2a"
         elif self.tile_id.startswith("S2B"):
             return "sentinel-2b"
+        elif self.tile_id.startswith("S2C"):
+            return "sentinel-2c"
+        elif self.tile_id.startswith("S2D"):
+            return "sentinel-2d"
         else:
             return None