diff --git a/lib/rails/generators/mobility/templates/create_string_translations.rb b/lib/rails/generators/mobility/templates/create_string_translations.rb
index d79388b4..e88870b0 100644
--- a/lib/rails/generators/mobility/templates/create_string_translations.rb
+++ b/lib/rails/generators/mobility/templates/create_string_translations.rb
@@ -4,7 +4,7 @@ def change
       t.string :locale, null: false
       t.string :key, null: false
       t.string :value
-      t.references :translatable, polymorphic: true, index: false
+      t.references :translatable, polymorphic: true, index: false, null: false
       t.timestamps null: false
     end
     add_index :mobility_string_translations, [:translatable_id, :translatable_type, :locale, :key], unique: true, name: :index_mobility_string_translations_on_keys
diff --git a/lib/rails/generators/mobility/templates/create_text_translations.rb b/lib/rails/generators/mobility/templates/create_text_translations.rb
index aa168c93..4df3136e 100644
--- a/lib/rails/generators/mobility/templates/create_text_translations.rb
+++ b/lib/rails/generators/mobility/templates/create_text_translations.rb
@@ -4,7 +4,7 @@ def change
       t.string :locale, null: false
       t.string :key,    null: false
       t.text :value
-      t.references :translatable, polymorphic: true, index: false
+      t.references :translatable, polymorphic: true, index: false, null: false
       t.timestamps null: false
     end
     add_index :mobility_text_translations, [:translatable_id, :translatable_type, :locale, :key], unique: true, name: :index_mobility_text_translations_on_keys