diff --git a/storage/cloud.py b/storage/cloud.py
index 6b6296042..d204efea9 100644
--- a/storage/cloud.py
+++ b/storage/cloud.py
@@ -307,9 +307,11 @@ class _CloudStorage(BaseStorageV2):
   def _client_side_chunk_join(self, final_path, chunk_list):
     # If there's only one chunk, just "move" (copy and delete) the key and call it a day.
     if len(chunk_list) == 1:
-      chunk_path = chunk_list[0].path
+      chunk_path = self._init_path(chunk_list[0].path)
+      abs_final_path = self._init_path(final_path)
+
       # Let the copy raise an exception if it fails.
-      self._cloud_bucket.copy_key(final_path, self._bucket_name, chunk_path)
+      self._cloud_bucket.copy_key(abs_final_path, self._bucket_name, chunk_path)
 
       # Attempt to clean up the old chunk.
       try:
@@ -317,7 +319,7 @@ class _CloudStorage(BaseStorageV2):
       except IOError:
         # We failed to delete a chunk. This sucks, but we shouldn't fail the push.
         msg = 'Failed to clean up chunk %s for move of %s'
-        logger.exception(msg, chunk_path, final_path)
+        logger.exception(msg, chunk_path, abs_final_path)
     else:
       # Concatenate and write all the chunks as one key.
       concatenated = filelike.FilelikeStreamConcat(self._chunk_generator(chunk_list))
@@ -326,7 +328,7 @@ class _CloudStorage(BaseStorageV2):
       # Attempt to clean up all the chunks.
       for chunk in chunk_list:
         try:
-          self._cloud_bucket.delete_key(chunk.path)
+          self._cloud_bucket.delete_key(self._init_path(chunk.path))
         except IOError:
           # We failed to delete a chunk. This sucks, but we shouldn't fail the push.
           msg = 'Failed to clean up chunk %s for reupload of %s'