diff --git a/python/ycm/vimsupport.py b/python/ycm/vimsupport.py
index 4c8564d3..650ad1b3 100644
--- a/python/ycm/vimsupport.py
+++ b/python/ycm/vimsupport.py
@@ -851,7 +851,7 @@ def InsertNamespace( namespace ):
   existing_indent = re.sub( r"\S.*", "", existing_line )
   new_line = "{0}using {1};\n\n".format( existing_indent, namespace )
   replace_pos = { 'line_num': line + 1, 'column_num': 1 }
-  ReplaceChunk( replace_pos, replace_pos, new_line, 0, 0 )
+  ReplaceChunk( replace_pos, replace_pos, new_line, 0, 0, vim.current.buffer )
   PostVimMessage( 'Add namespace: {0}'.format( namespace ), warning = False )