1 files changed, 2 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/internal_metadata.rb b/activerecord/lib/active_record/internal_metadata.rb
index 2e962f4218..e5c6e5c885 100644
--- a/activerecord/lib/active_record/internal_metadata.rb
+++ b/activerecord/lib/active_record/internal_metadata.rb
@@ -33,13 +33,12 @@ module ActiveRecord
       # Creates an internal metadata table with columns +key+ and +value+
       def create_table
         unless table_exists?
-          connection.create_table(table_name, primary_key: :key, id: false ) do |t|
+          connection.create_table(table_name, id: false) do |t|
             t.column :key,   :string
             t.column :value, :string
             t.timestamps
+            t.index  :key, unique: true, name: index_name
           end
-
-          connection.add_index table_name, :key, unique: true, name: index_name
         end
       end
     end