diff --git a/grudge/symbolic/mappers/__init__.py b/grudge/symbolic/mappers/__init__.py
index 304bfb4c66db61a5a1f539137179962a9717251d..df53cadf86e69cf3ca97081cf9c3618570120450 100644
--- a/grudge/symbolic/mappers/__init__.py
+++ b/grudge/symbolic/mappers/__init__.py
@@ -844,7 +844,7 @@ class StringifyMapper(pymbolic.mapper.stringifier.StringifyMapper):
         return "%s:%s" % (expr.name, self._format_dd(expr.dd))
 
     def map_function_symbol(self, expr, enclosing_prec):
-        return expr
+        return expr.name
 
     def map_interpolation(self, expr, enclosing_prec):
         return "Interp" + self._format_op_dd(expr)