diff --git a/compiler/rustc_mir_transform/src/dataflow_const_prop.rs b/compiler/rustc_mir_transform/src/dataflow_const_prop.rs
index 0fd85eb345d..8b965f4d18e 100644
--- a/compiler/rustc_mir_transform/src/dataflow_const_prop.rs
+++ b/compiler/rustc_mir_transform/src/dataflow_const_prop.rs
@@ -181,11 +181,6 @@ fn handle_assign(
                         state.insert_value_idx(value_target, val, self.map());
                     }
                     if let Some(overflow_target) = overflow_target {
-                        let overflow = match overflow {
-                            FlatSet::Top => FlatSet::Top,
-                            FlatSet::Elem(overflow) => FlatSet::Elem(overflow),
-                            FlatSet::Bottom => FlatSet::Bottom,
-                        };
                         // We have flooded `target` earlier.
                         state.insert_value_idx(overflow_target, overflow, self.map());
                     }