diff --git a/pymbolic/primitives.py b/pymbolic/primitives.py
index 1b4977a..736ad51 100644
--- a/pymbolic/primitives.py
+++ b/pymbolic/primitives.py
@@ -478,19 +478,19 @@ def __rmul__(self, other: object) -> Product:
         return Product((other, self))
 
     def __truediv__(self, other: object) -> Quotient:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return Quotient(self, other)
 
     def __rtruediv__(self, other: object) -> Quotient:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return Quotient(other, self)
 
     def __floordiv__(self, other: object) -> FloorDiv:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return FloorDiv(self, other)
@@ -502,25 +502,25 @@ def __rfloordiv__(self, other: object) -> FloorDiv:
         return FloorDiv(other, self)
 
     def __mod__(self, other: object) -> Remainder:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return Remainder(self, other)
 
     def __rmod__(self, other: object) -> Remainder:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return Remainder(other, self)
 
     def __pow__(self, other: object) -> Power:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return Power(self, other)
 
     def __rpow__(self, other: object) -> Power:
-        if not is_valid_operand(other):
+        if not is_arithmetic_expression(other):
             return NotImplemented
 
         return Power(other, self)