diff --git a/src/librustc_mir/interpret/snapshot.rs b/src/librustc_mir/interpret/snapshot.rs
index 0168e1301fa7a..8bb663f846b73 100644
--- a/src/librustc_mir/interpret/snapshot.rs
+++ b/src/librustc_mir/interpret/snapshot.rs
@@ -431,7 +431,7 @@ impl<'a, 'mir, 'tcx> Eq for EvalSnapshot<'a, 'mir, 'tcx>
 impl<'a, 'mir, 'tcx> PartialEq for EvalSnapshot<'a, 'mir, 'tcx>
 {
     fn eq(&self, other: &Self) -> bool {
-        // FIXME: This looks to be a *ridicolously expensive* comparison operation.
+        // FIXME: This looks to be a *ridiculously expensive* comparison operation.
         // Doesn't this make tons of copies?  Either `snapshot` is very badly named,
         // or it does!
         self.snapshot() == other.snapshot()