diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 7f4be54dbb..a8bed82e19 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -14,7 +14,8 @@
 
     *Pavel Evstigneev*
 
-*   Avoid `unscope(:order)` when `limit_value` is presented for `count`.
+*   Avoid `unscope(:order)` when `limit_value` is presented for `count`
+    and `exists?`.
 
     If `limit_value` is presented, records fetching order is very important
     for performance. We should not unscope the order in the case.
diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index 97a819c5af..55ded4c6d0 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -321,7 +321,7 @@ module ActiveRecord
       relation = apply_join_dependency(self, construct_join_dependency(eager_loading: false))
       return false if ActiveRecord::NullRelation === relation
 
-      relation = relation.except(:select, :order).select(ONE_AS_ONE).limit(1)
+      relation = relation.except(:select, :distinct).select(ONE_AS_ONE).limit(1)
 
       case conditions
       when Array, Hash