diff --git a/arraycontext/fake_numpy.py b/arraycontext/fake_numpy.py
index 916d79d2d179f20bafb0e3af8f13b9431a4c2b34..251a5a27f5e9875455feb2c669404b2d71348b10 100644
--- a/arraycontext/fake_numpy.py
+++ b/arraycontext/fake_numpy.py
@@ -148,7 +148,9 @@ class BaseFakeNumpyNamespace:
     def __getattr__(self, name):
         def loopy_implemented_elwise_func(*args):
             if all(np.isscalar(ary) for ary in args):
-                return getattr(np, name)(*args)
+                return getattr(
+                        np, self._c_to_numpy_arc_functions.get(name, name)
+                        )(*args)
 
             actx = self._array_context
             prg = _get_scalar_func_loopy_program(actx,
@@ -160,7 +162,7 @@ class BaseFakeNumpyNamespace:
         if name in self._c_to_numpy_arc_functions:
             from warnings import warn
             warn(f"'{name}' in ArrayContext.np is deprecated. "
-                    "Use '{c_to_numpy_arc_functions[name]}' as in numpy. "
+                    f"Use '{self._c_to_numpy_arc_functions[name]}' as in numpy. "
                     "The old name will stop working in 2021.",
                     DeprecationWarning, stacklevel=3)
 
diff --git a/test/test_arraycontext.py b/test/test_arraycontext.py
index d97f00f0f1dd1a72c997109e28914376c917652d..39e49b22a42402788959273793a4a2c322fc9496 100644
--- a/test/test_arraycontext.py
+++ b/test/test_arraycontext.py
@@ -283,6 +283,8 @@ def assert_close_to_numpy_in_containers(actx, op, args):
             ("max", 1, np.float64),
             ("any", 1, np.float64),
             ("all", 1, np.float64),
+            ("arctan", 1, np.float64),
+            ("atan", 1, np.float64),
 
             # float + complex
             ("sin", 1, np.float64),