diff --git a/pystac/extensions/__init__.py b/pystac/extensions/__init__.py
index d3fcc7034..2b8269cf5 100644
--- a/pystac/extensions/__init__.py
+++ b/pystac/extensions/__init__.py
@@ -18,7 +18,7 @@ class Extensions:
     POINTCLOUD = 'pointcloud'
     PROJECTION = 'projection'
     SAR = 'sar'
-    SATELLITE = 'satellite'
+    SATELLITE = 'sat'
     SCIENTIFIC = 'scientific'
     SINGLE_FILE_STAC = 'single-file-stac'
     TILED_ASSETS = 'tiled-assets'