diff --git a/src/common/connection_handlers.py b/src/common/connection_handlers.py
index 832434bbde97c13488ebfada6140e2c503a5cfb1..4d0f412422b0cb14451539a0a5de7d13717410e9 100644
--- a/src/common/connection_handlers.py
+++ b/src/common/connection_handlers.py
@@ -224,6 +224,8 @@ class ConnectionBytestream:
 		si = iq.setTag('si')
 		si.setNamespace(common.xmpp.NS_SI)
 		if file_props.has_key('offset') and file_props['offset']:
+			file_tag = si.setTag('file')
+			file_tag.setNamespace(common.xmpp.NS_FILE)
 			range_tag = file_tag.setTag('range')
 			range_tag.setAttr('offset', file_props['offset'])
 		feature = si.setTag('feature')