diff --git a/sumpy/codegen.py b/sumpy/codegen.py
index 8eef989200c0ab3aaa9ccc1a793488e160a794a0..99e4f47d4c241efcf13fbfd4f180f37a1c914782 100644
--- a/sumpy/codegen.py
+++ b/sumpy/codegen.py
@@ -656,7 +656,7 @@ def to_loopy_insns(assignments, vector_names=set(), pymbolic_expr_maps=[],
     assignments = list(assignments)
 
     # convert from sympy
-    sympy_conv = SympyToPymbolicMapper(assignments)
+    sympy_conv = SympyToPymbolicMapper()
     assignments = [(name, sympy_conv(expr)) for name, expr in assignments]
 
     assignments = kill_trivial_assignments(assignments, retain_names)