diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
index 4b5e077aaa092..ccd88144069da 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
@@ -528,8 +528,10 @@ def check_constraints(table_name) # :nodoc:
             SELECT conname, pg_get_constraintdef(c.oid, true) AS constraintdef, c.convalidated AS valid
             FROM pg_constraint c
             JOIN pg_class t ON c.conrelid = t.oid
+            JOIN pg_namespace n ON n.oid = c.connamespace
             WHERE c.contype = 'c'
               AND t.relname = #{scope[:name]}
+              AND n.nspname = #{scope[:schema]}
           SQL
 
           check_info.map do |row|
diff --git a/activerecord/test/cases/migration/check_constraint_test.rb b/activerecord/test/cases/migration/check_constraint_test.rb
index a7d119ea7209b..ef71281bc7698 100644
--- a/activerecord/test/cases/migration/check_constraint_test.rb
+++ b/activerecord/test/cases/migration/check_constraint_test.rb
@@ -58,6 +58,22 @@ def test_check_constraints
           end
         end
 
+        if current_adapter?(:PostgreSQLAdapter)
+          def test_check_constraints_scoped_to_schemas
+            @connection.add_check_constraint :trades, "quantity > 0"
+
+            assert_no_changes -> { @connection.check_constraints("trades").size } do
+              @connection.create_schema "test_schema"
+              @connection.create_table "test_schema.trades" do |t|
+                t.integer :quantity
+              end
+              @connection.add_check_constraint "test_schema.trades", "quantity > 0"
+            end
+          ensure
+            @connection.drop_schema "test_schema"
+          end
+        end
+
         def test_add_check_constraint
           @connection.add_check_constraint :trades, "quantity > 0"