diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index 12ca029..8a19c7a 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -542,10 +542,10 @@ module ActiveRecord
       # Maps logical Rails types to MySQL-specific data types.
       def type_to_sql(type, limit = nil, precision = nil, scale = nil)
         case type.to_s
-        when 'primary_key':
+        when 'primary_key'
           native = native_database_types[:primary_key]
           return type_to_sql('integer', limit) + ' ' + native[:name]
-        when 'integer':
+        when 'integer'
           case limit
           when 1; 'tinyint'
           when 2; 'smallint'