diff --git a/tests/ui/unexpected-arg.rs b/tests/ui/unexpected-arg.rs
new file mode 100644
index 0000000..376fc0d
--- /dev/null
+++ b/tests/ui/unexpected-arg.rs
@@ -0,0 +1,8 @@
+use proc_macro_hack::proc_macro_hack;
+
+#[proc_macro_hack(fake_call_site)]
+pub fn my_macro(input: TokenStream) -> TokenStream {
+    unimplemented!()
+}
+
+fn main() {}
diff --git a/tests/ui/unexpected-arg.stderr b/tests/ui/unexpected-arg.stderr
new file mode 100644
index 0000000..6895e82
--- /dev/null
+++ b/tests/ui/unexpected-arg.stderr
@@ -0,0 +1,5 @@
+error: unexpected argument to proc_macro_hack macro implementation; args are only accepted on the macro declaration (the `pub use`)
+ --> $DIR/unexpected-arg.rs:3:19
+  |
+3 | #[proc_macro_hack(fake_call_site)]
+  |                   ^^^^^^^^^^^^^^
diff --git a/tests/ui/unknown-arg.stderr b/tests/ui/unknown-arg.stderr
index d3cd8c9..ffe3705 100644
--- a/tests/ui/unknown-arg.stderr
+++ b/tests/ui/unknown-arg.stderr
@@ -1,4 +1,4 @@
-error: expected one of: `support_nested`, `internal_macro_calls`, `fake_call_site`
+error: expected one of: `support_nested`, `internal_macro_calls`, `fake_call_site`, `only_hack_old_rustc`
  --> $DIR/unknown-arg.rs:3:35
   |
 3 | #[proc_macro_hack(fake_call_site, support_nexted)]