diff --git a/andes/core/model/model.py b/andes/core/model/model.py
index 9760f7de5..a2eae10bb 100644
--- a/andes/core/model/model.py
+++ b/andes/core/model/model.py
@@ -516,7 +516,7 @@ def set(self, src, idx, attr, value):
                     self.system.dae.Tf[state.a[uid]] = instance.v[uid]
                     uid_int = state.a[uid].item()
                     self.system.TDS.Teye[uid_int, uid_int] = instance.v[uid]
-        
+
         return True
 
     def alter(self, src, idx, value):