diff --git a/pymbolic/mapper/stringifier.py b/pymbolic/mapper/stringifier.py
index 192641452c904835285674edc5e915d4045c6fe2..225090b1ccd65ff128384679f62f06ee25e5f3fc 100644
--- a/pymbolic/mapper/stringifier.py
+++ b/pymbolic/mapper/stringifier.py
@@ -109,7 +109,7 @@ class StringifyMapper(pymbolic.mapper.RecursiveMapper):
     def map_polynomial(self, expr, enclosing_prec):
         from pymbolic.primitives import flattened_sum
         return self.rec(flattened_sum(
-            [coeff*base**exp for exp, coeff in expr.data[::-1]]),
+            [coeff*expr.base**exp for exp, coeff in expr.data[::-1]]),
             enclosing_prec)
 
     def map_list(self, expr, enclosing_prec):