diff --git a/mathics/core/convert/sympy.py b/mathics/core/convert/sympy.py
index df091e1c3..5794e912b 100644
--- a/mathics/core/convert/sympy.py
+++ b/mathics/core/convert/sympy.py
@@ -4,7 +4,7 @@
 Converts expressions from SymPy to Mathics expressions.
 Conversion to SymPy is handled directly in BaseElement descendants.
 """
-from typing import TYPE_CHECKING, Dict, List, Optional, Sequence, Tuple, Union, cast
+from typing import TYPE_CHECKING, Dict, Iterator, List, Optional, Sequence, Tuple, Union, cast
 
 import sympy
 from sympy import Symbol as Sympy_Symbol, false as SympyFalse, true as SympyTrue
@@ -207,6 +207,9 @@ def is_commutative(self, value: bool) -> None:
     def __str__(self) -> str:
         return f"{super().__str__()}[{self.expr}])"
 
+    def __iter__(self) -> Iterator:
+        return iter(self.args)
+
 
 class SympyPrime(sympy.Function):
     """