diff --git a/pytential/symbolic/primitives.py b/pytential/symbolic/primitives.py
index 1f4fd48583468dc31384429796527564cd424669..ea59b67652ef5cc1ecdce44fb95ce3c63bd70a49 100644
--- a/pytential/symbolic/primitives.py
+++ b/pytential/symbolic/primitives.py
@@ -434,9 +434,9 @@ def array_to_tuple(ary):
 
 
 class Expression(ExpressionBase):
-    def stringifier(self):
+    def make_stringifier(self, originating_stringifier=None):
         from pytential.symbolic.mappers import StringifyMapper
-        return StringifyMapper
+        return StringifyMapper()
 
 
 def make_sym_mv(name, num_components):