diff --git a/src/librustc_mir/transform/const_prop.rs b/src/librustc_mir/transform/const_prop.rs
index a6e01918529d..4e214c3c7253 100644
--- a/src/librustc_mir/transform/const_prop.rs
+++ b/src/librustc_mir/transform/const_prop.rs
@@ -639,7 +639,7 @@ fn visit_statement(
                             assert!(self.places[local].is_none());
                             self.places[local] = Some(value);
 
-                            if self.tcx.sess.opts.debugging_opts.mir_opt_level >= 3 {
+                            if self.tcx.sess.opts.debugging_opts.mir_opt_level >= 2 {
                                 self.replace_with_const(rval, value, statement.source_info.span);
                             }
                         }