diff --git a/src/librustc/infer/region_constraints/mod.rs b/src/librustc/infer/region_constraints/mod.rs
index 931a5fed02101..0775c6dac849b 100644
--- a/src/librustc/infer/region_constraints/mod.rs
+++ b/src/librustc/infer/region_constraints/mod.rs
@@ -232,7 +232,7 @@ type CombineMap<'tcx> = FxHashMap<TwoRegions<'tcx>, RegionVid>;
 
 pub struct RegionSnapshot {
     length: usize,
-    region_snapshot: unify::Snapshot<ty::RegionVid>,
+    region_snapshot: ut::Snapshot<ut::InPlace<ty::RegionVid>>,
     skolemization_count: u32,
 }