diff --git a/tests/ui/unknown_attribute.rs b/tests/ui/unknown_attribute.rs
new file mode 100644
index 000000000..8d6956928
--- /dev/null
+++ b/tests/ui/unknown_attribute.rs
@@ -0,0 +1,3 @@
+#[clippy::unknown]
+#[clippy::cyclomatic_complexity = "1"]
+fn main() {}
diff --git a/tests/ui/unknown_attribute.stderr b/tests/ui/unknown_attribute.stderr
new file mode 100644
index 000000000..47e37aed2
--- /dev/null
+++ b/tests/ui/unknown_attribute.stderr
@@ -0,0 +1,8 @@
+error: Usage of unknown attribute
+  --> $DIR/unknown_attribute.rs:1:11
+   |
+LL | #[clippy::unknown]
+   |           ^^^^^^^
+
+error: aborting due to previous error
+