diff --git a/tests/ui/attributes/proc-macro-unsafe.rs b/tests/ui/attributes/proc-macro-unsafe.rs
new file mode 100644
index 000000000000..7849df825609
--- /dev/null
+++ b/tests/ui/attributes/proc-macro-unsafe.rs
@@ -0,0 +1,9 @@
+//@ proc-macro: external-macro-use.rs
+
+extern crate external_macro_use;
+
+#[unsafe(external_macro_use::a)]
+//~^ ERROR unnecessary `unsafe` on safe attribute
+fn f() {}
+
+fn main() {}
diff --git a/tests/ui/attributes/proc-macro-unsafe.stderr b/tests/ui/attributes/proc-macro-unsafe.stderr
new file mode 100644
index 000000000000..ccc19bb01d2f
--- /dev/null
+++ b/tests/ui/attributes/proc-macro-unsafe.stderr
@@ -0,0 +1,8 @@
+error: unnecessary `unsafe` on safe attribute
+  --> $DIR/proc-macro-unsafe.rs:5:3
+   |
+LL | #[unsafe(external_macro_use::a)]
+   |   ^^^^^^
+
+error: aborting due to 1 previous error
+