diff --git a/src/librustc_mir/borrow_check/nll/explain_borrow/mod.rs b/src/librustc_mir/borrow_check/nll/explain_borrow/mod.rs
index ff4243df6e9b8..e6a33f8e6adf2 100644
--- a/src/librustc_mir/borrow_check/nll/explain_borrow/mod.rs
+++ b/src/librustc_mir/borrow_check/nll/explain_borrow/mod.rs
@@ -457,7 +457,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     /// True if an edge `source -> target` is a backedge -- in other words, if the target
     /// dominates the source.
     fn is_back_edge(&self, source: Location, target: Location) -> bool {
-        target.dominates(source, &self.body.dominators())
+        target.dominates(source, &self.dominators)
     }
 
     /// Determine how the borrow was later used.