diff --git a/prody/atomic/atomgroup.py b/prody/atomic/atomgroup.py
index 929a31a87..3a9b18f0a 100644
--- a/prody/atomic/atomgroup.py
+++ b/prody/atomic/atomgroup.py
@@ -698,7 +698,7 @@ def addCoordset(self, coords, label=None, anisous=None):
         if coords.ndim == 2:
             coords = coords.reshape((1, n_atoms, 3))
 
-        if anisous.ndim == 2 and self._data['anisou'].ndim == 3:
+        if anisous.ndim == 2:
             anisous = anisous.reshape((1, n_atoms, 6))
 
         diff = coords.shape[0]