diff --git a/googleapiclient/http.py b/googleapiclient/http.py
index d492aba..66af5d8 100644
--- a/googleapiclient/http.py
+++ b/googleapiclient/http.py
@@ -74,7 +74,7 @@
 
 LOGGER = logging.getLogger(__name__)
 
-DEFAULT_CHUNK_SIZE = 512*1024
+DEFAULT_CHUNK_SIZE = 100*1024*1024
 
 MAX_URI_LENGTH = 2048