diff --git a/s3contents/genericmanager.py b/s3contents/genericmanager.py
index 2982f96..958adb6 100644
--- a/s3contents/genericmanager.py
+++ b/s3contents/genericmanager.py
@@ -279,14 +279,14 @@ def save(self, model, path):
         return model
 
     def _save_chunked(self, chunk, model, path):
-        prune_stale_chunks()
-
         if not CHUNKS_HANDLING:
             self.log.error(
                 "S3contents.GenericManager._save_chunked: not available with Python < 3.7"
             )
             self.do_error("Chunked file upload in S3/GCS requires Python >= 3.7", 500)
 
+        prune_stale_chunks()
+
         if "type" not in model:
             self.do_error("No file type provided", 400)
         if model["type"] != "file":