diff --git a/clippy_lints/src/utils/internal_lints.rs b/clippy_lints/src/utils/internal_lints.rs
index 5beb4be5b2924..f201494a02466 100644
--- a/clippy_lints/src/utils/internal_lints.rs
+++ b/clippy_lints/src/utils/internal_lints.rs
@@ -704,7 +704,7 @@ impl<'tcx> LateLintPass<'tcx> for MatchTypeOnDiagItem {
                     cx,
                     MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
                     expr.span,
-                    "usage of `utils::match_type() on a type diagnostic item`",
+                    "usage of `utils::match_type()` on a type diagnostic item",
                     "try",
                     format!("utils::is_type_diagnostic_item({}, {}, sym!({}))", cx_snippet, ty_snippet, item_name),
                     Applicability::MaybeIncorrect,
diff --git a/tests/ui/match_type_on_diag_item.stderr b/tests/ui/match_type_on_diag_item.stderr
index c89137eb758f0..5e5fe9e3a3e73 100644
--- a/tests/ui/match_type_on_diag_item.stderr
+++ b/tests/ui/match_type_on_diag_item.stderr
@@ -1,4 +1,4 @@
-error: usage of `utils::match_type() on a type diagnostic item`
+error: usage of `utils::match_type()` on a type diagnostic item
   --> $DIR/match_type_on_diag_item.rs:41:17
    |
 LL |         let _ = match_type(cx, ty, &paths::VEC);
@@ -11,19 +11,19 @@ LL | #![deny(clippy::internal)]
    |         ^^^^^^^^^^^^^^^^
    = note: `#[deny(clippy::match_type_on_diagnostic_item)]` implied by `#[deny(clippy::internal)]`
 
-error: usage of `utils::match_type() on a type diagnostic item`
+error: usage of `utils::match_type()` on a type diagnostic item
   --> $DIR/match_type_on_diag_item.rs:42:17
    |
 LL |         let _ = match_type(cx, ty, &OPTION);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `utils::is_type_diagnostic_item(cx, ty, sym!(option_type))`
 
-error: usage of `utils::match_type() on a type diagnostic item`
+error: usage of `utils::match_type()` on a type diagnostic item
   --> $DIR/match_type_on_diag_item.rs:43:17
    |
 LL |         let _ = match_type(cx, ty, &["core", "result", "Result"]);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `utils::is_type_diagnostic_item(cx, ty, sym!(result_type))`
 
-error: usage of `utils::match_type() on a type diagnostic item`
+error: usage of `utils::match_type()` on a type diagnostic item
   --> $DIR/match_type_on_diag_item.rs:46:17
    |
 LL |         let _ = utils::match_type(cx, ty, rc_path);