diff --git a/src/Eccube/Resource/template/admin/Form/bootstrap_4_horizontal_layout.html.twig b/src/Eccube/Resource/template/admin/Form/bootstrap_4_horizontal_layout.html.twig
index 55d6c042e3b..4323236441c 100644
--- a/src/Eccube/Resource/template/admin/Form/bootstrap_4_horizontal_layout.html.twig
+++ b/src/Eccube/Resource/template/admin/Form/bootstrap_4_horizontal_layout.html.twig
@@ -45,3 +45,7 @@ file that was distributed with this source code.
     {% endif %}
 {% endblock %}
 
+{%- block file_widget -%}
+    {%- set attr = attr|merge({class: (attr.class|default('') ~ 'form-control-file')|trim}) -%}
+    <input type="file" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
+{%- endblock -%}
diff --git a/src/Eccube/Resource/template/admin/Store/plugin_install.twig b/src/Eccube/Resource/template/admin/Store/plugin_install.twig
index 3324b341c98..34af6b79e76 100644
--- a/src/Eccube/Resource/template/admin/Store/plugin_install.twig
+++ b/src/Eccube/Resource/template/admin/Store/plugin_install.twig
@@ -15,6 +15,8 @@ file that was distributed with this source code.
 {% block title %}独自プラグインのアップロード{% endblock %}
 {% block sub_title %}オーナーズストア{% endblock %}
 
+{% form_theme form '@admin/Form/bootstrap_4_horizontal_layout.html.twig' %}
+
 {% block main %}
     <form id="upload-form" class="" method="post" action="{{ url('admin_store_plugin_install') }}" enctype="multipart/form-data">
         {{ form_widget(form._token) }}
@@ -43,4 +45,4 @@ file that was distributed with this source code.
             </div>
         </div>
     </form>
-{% endblock %}
\ No newline at end of file
+{% endblock %}
diff --git a/src/Eccube/Resource/template/admin/Store/plugin_table.twig b/src/Eccube/Resource/template/admin/Store/plugin_table.twig
index 024fa08f7c9..8d2d1af0015 100644
--- a/src/Eccube/Resource/template/admin/Store/plugin_table.twig
+++ b/src/Eccube/Resource/template/admin/Store/plugin_table.twig
@@ -32,6 +32,7 @@ $(function() {
             <tbody>
             {% for Plugin in Plugins %}
                 {% set form = plugin_forms[Plugin.id] %}
+                {% form_theme form '@admin/Form/bootstrap_4_horizontal_layout.html.twig' %}
                 <form id="{{ form.vars.name }}" name="{{ form.vars.name }}" method="post" action=""
                       enctype="multipart/form-data">
                     <tr class="{% if Plugin.enabled == false %}active{% endif %}">