diff --git a/lib/rapi/rlib2.py b/lib/rapi/rlib2.py
index fb607ed8412f9d4f0650e49d5f1c3a7c8e380015..dc28a863cf0e20890c5f897eb56d082850004b9a 100644
--- a/lib/rapi/rlib2.py
+++ b/lib/rapi/rlib2.py
@@ -364,7 +364,7 @@ class R_2_instances_name_tags(baserlib.R_Generic):
 
     """
     return baserlib._Tags_PUT(constants.TAG_INSTANCE,
-                               self.post_data, name=self.items[0])
+                              self.req.request_post_data, name=self.items[0])
 
   def DELETE(self):
     """Delete a tag.