Rename Result.Resp to Result.Body.
diff --git a/openstack/blockstorage/v1/volumes/results.go b/openstack/blockstorage/v1/volumes/results.go
index 421e4ca..7215daf 100644
--- a/openstack/blockstorage/v1/volumes/results.go
+++ b/openstack/blockstorage/v1/volumes/results.go
@@ -77,7 +77,7 @@
 		Volume *Volume `json:"volume"`
 	}
 
-	err := mapstructure.Decode(r.Resp, &res)
+	err := mapstructure.Decode(r.Body, &res)
 
 	return res.Volume, err
 }