2 files changed, 7 insertions, 6 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb
index ce773ed75b..0cf40de70f 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb
@@ -3,7 +3,10 @@ module ActiveRecord
     module MySQL
       module ColumnMethods
         def primary_key(name, type = :primary_key, **options)
-          options[:auto_increment] = true if type == :bigint && !options.key?(:default)
+          if type == :primary_key && !options.key?(:default)
+            options[:auto_increment] = true
+            options[:limit] = 8
+          end
           super
         end
 
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
index 9b02d8a34b..2065816501 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
@@ -3,11 +3,9 @@ module ActiveRecord
     module MySQL
       module ColumnDumper
         def column_spec_for_primary_key(column)
-          if column.bigint?
-            spec = { id: :bigint.inspect }
-            spec[:default] = schema_default(column) || "nil" unless column.auto_increment?
-          else
-            spec = super
+          spec = super
+          if column.type == :integer && !column.auto_increment?
+            spec[:default] = schema_default(column) || "nil"
           end
           spec[:unsigned] = "true" if column.unsigned?
           spec