diff --git a/pyzebra/h5.py b/pyzebra/h5.py
index ad8d1c1..ad4a733 100644
--- a/pyzebra/h5.py
+++ b/pyzebra/h5.py
@@ -2,9 +2,9 @@ import h5py
 import numpy as np
 from lmfit.models import Gaussian2dModel, GaussianModel
 
-META_MATRIX = ("UB")
-META_CELL = ("cell")
-META_STR = ("name")
+META_MATRIX = ("UB", )
+META_CELL = ("cell", )
+META_STR = ("name", )
 
 def read_h5meta(filepath):
     """Open and parse content of a h5meta file.