diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index <HASH>..<HASH> 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -381,9 +381,9 @@ module ActiveRecord
 
         def default_primary_key_type
           if supports_autoincrement?
-            'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'.freeze
+            'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'
           else
-            'INTEGER PRIMARY KEY NOT NULL'.freeze
+            'INTEGER PRIMARY KEY NOT NULL'
           end
         end
these strings do not need to be frozen