diff --git a/test/test_pymbolic.py b/test/test_pymbolic.py
index a049cd2d33098a8dff11fbab51c2c8d3ff48c29d..5df21846f8bfe5dd22132c20e93248ef2adcf6fe 100644
--- a/test/test_pymbolic.py
+++ b/test/test_pymbolic.py
@@ -95,7 +95,7 @@ def test_sympy_interaction():
     import sympy as sp
 
     x, y = sp.symbols("x y")
-    f = sp.symbols("f")
+    f = sp.Function("f")
 
     s1_expr = 1/f(x/sp.sqrt(x**2+y**2)).diff(x, 5)