diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index 29daf7e9309aa36716a15ad9e430b5e5f3926580..467d0192a8144ef796236e2b5bb8047a9054bb2e 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -2285,7 +2285,7 @@ fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
 /// Constants
 ///
 /// Two constants are equal if they are the same constant. Note that
-/// this does not necessarily mean that they are `==` in Rust -- in
+/// this does not necessarily mean that they are `==` in Rust. In
 /// particular, one must be wary of `NaN`!
 
 #[derive(Clone, Copy, PartialEq, TyEncodable, TyDecodable, HashStable)]