diff --git a/src/librustc_mir/borrow_check/nll/region_infer/values.rs b/src/librustc_mir/borrow_check/nll/region_infer/values.rs
index 290277b1d08..8db5809e53f 100644
--- a/src/librustc_mir/borrow_check/nll/region_infer/values.rs
+++ b/src/librustc_mir/borrow_check/nll/region_infer/values.rs
@@ -183,7 +183,7 @@ impl<N: Idx> LivenessValues<N> {
 ///
 /// Example:
 ///
-/// ```rust
+/// ```text
 /// fn foo(x: &'a u32) -> &'a u32 {
 ///    let y: &'0 u32 = x; // let's call this `'0`
 ///    y