diff --git a/modules/bindings/pymod/clustalw.py b/modules/bindings/pymod/clustalw.py
index a1327ee7e3d8611dd86a0adea70026502201dca2..f61d4f24f3f074badf749ae01f29b6893364dd87 100644
--- a/modules/bindings/pymod/clustalw.py
+++ b/modules/bindings/pymod/clustalw.py
@@ -41,7 +41,7 @@ def ClustalW(seq1, seq2=None, clustalw=None, keep_files=False):
     for seq_num,aln_seq in enumerate(aln.sequences):
       if aln_seq.GetName()==sequence.GetName():
         break
-    aln.SetSequenceOffset(seq_num,sequence.GetSequenceOffset())
+    aln.SetSequenceOffset(seq_num,sequence.offset)
     if sequence.HasAttachedView():
       aln.AttachView(seq_num,sequence.GetAttachedView().Copy())