diff --git a/python/pandaset/annotations.py b/python/pandaset/annotations.py
index 181ba17..54f3d56 100644
--- a/python/pandaset/annotations.py
+++ b/python/pandaset/annotations.py
@@ -92,7 +92,7 @@ class Cuboids(Annotation):
 
     @property
     def _data_file_extension(self) -> str:
-        return 'pkl.gz'
+        return 'pkl'
 
     @property
     def data(self) -> List[pd.DataFrame]:
@@ -203,7 +203,7 @@ class SemanticSegmentation(Annotation):
 
     @property
     def _data_file_extension(self) -> str:
-        return 'pkl.gz'
+        return 'pkl'
 
     @property
     def data(self) -> List[pd.DataFrame]:
diff --git a/python/pandaset/sensors.py b/python/pandaset/sensors.py
index a3dec3f..1894b1f 100644
--- a/python/pandaset/sensors.py
+++ b/python/pandaset/sensors.py
@@ -134,7 +134,7 @@ def _load_data_file(self, fp: str) -> None:
 class Lidar(Sensor):
     @property
     def _data_file_extension(self) -> str:
-        return 'pkl.gz'
+        return 'pkl'
 
     @property
     def data(self) -> List[pd.DataFrame]: