diff --git a/lix/nix/flake.cc b/lix/nix/flake.cc
index 52db3e4b1..ea8550a9b 100644
--- a/lix/nix/flake.cc
+++ b/lix/nix/flake.cc
@@ -469,11 +469,6 @@ struct CmdFlakeCheck : FlakeCommand
                 if (!v.isLambda()) {
                     throw Error("overlay is not a function, but %s instead", showType(v));
                 }
-                auto body = v.lambda().fun->body->try_cast<ExprLambda>();
-                if (!body)
-                    throw Error("overlay is not a function with two arguments, but only takes one");
-                if (body->body->try_cast<ExprLambda>())
-                    throw Error("overlay is not a function with two arguments, but takes more than two");
                 // FIXME: if we have a 'nixpkgs' input, use it to
                 // evaluate the overlay.
             } catch (Error & e) {
diff --git a/tests/functional2/flakes/test_check.py b/tests/functional2/flakes/test_check.py
index 756518720..f5359165e 100644
--- a/tests/functional2/flakes/test_check.py
+++ b/tests/functional2/flakes/test_check.py
@@ -34,34 +34,6 @@ def test_check_overlay_args_good(nix: Nix, files: Path):
     nix.nix(["flake", "check", str(files)]).run().ok()
 
 
-@with_files(
-    make_flake("""{
-      outputs = { self }: {
-        overlay = one: two: three: {};
-      };
-    }""")
-)
-def test_check_overlay_too_many_args(nix: Nix, files: Path):
-    assert (
-        "error: overlay is not a function with two arguments, but takes more than two"
-        in nix.nix(["flake", "check", str(files)]).run().expect(1).stderr_s
-    )
-
-
-@with_files(
-    make_flake("""{
-      outputs = { self }: {
-        overlay = one: {};
-      };
-    }""")
-)
-def test_check_overlay_not_enough_args(nix: Nix, files: Path):
-    assert (
-        "error: overlay is not a function with two arguments, but only takes one"
-        in nix.nix(["flake", "check", str(files)]).run().expect(1).stderr_s
-    )
-
-
 @with_files(
     make_flake("""{
       outputs = { self, ... }: {