diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index e954bd2fb7fb4..93f041b2ac547 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,7 +1,13 @@
 ## Rails 5.0.0.rc1 (May 06, 2016) ##
 
-*   No changes.
+*   Merge parent joins for through associations.
 
+    Merges parent associations joins for through associations into a scope. Previously joins in association scope were
+    taken into account only for root associations with that scope.
+
+    Fixes #22538.
+
+    *Seva Orlov*
 
 ## Rails 5.0.0.beta4 (April 27, 2016) ##
 
diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb
index 4ef353789fe6c..ccf3f077f1e6e 100644
--- a/activerecord/lib/active_record/associations/association_scope.rb
+++ b/activerecord/lib/active_record/associations/association_scope.rb
@@ -158,8 +158,9 @@ def add_constraints(scope, owner, association_klass, refl, chain_head, chain_tai
         scope
       end
 
+      # Merges inner joins from `other` relation to `scope` relation.
       def merge_joins(scope, other)
-        joins_dependency, rest = other.joins_values.partition do |join|
+        association_joins, rest_joins = other.joins_values.partition do |join|
           case join
           when Hash, Symbol, Array
             true
@@ -168,7 +169,7 @@ def merge_joins(scope, other)
           end
         end
 
-        join_dependency = ActiveRecord::Associations::JoinDependency.new(other.klass, joins_dependency, rest)
+        join_dependency = ActiveRecord::Associations::JoinDependency.new(other.klass, association_joins, rest_joins)
         scope.joins! join_dependency.join_constraints([], Arel::Nodes::InnerJoin).map(&:joins)
       end