diff --git a/python/nav/web/arnold/forms.py b/python/nav/web/arnold/forms.py
index fe9de939d7..88c06df10e 100644
--- a/python/nav/web/arnold/forms.py
+++ b/python/nav/web/arnold/forms.py
@@ -240,10 +240,10 @@ class ManualDetentionTargetForm(forms.Form):
 
     def __init__(self, *args, **kwargs):
         super(ManualDetentionTargetForm, self).__init__(*args, **kwargs)
-        self.helper = FormHelper()
-        self.helper.form_action = 'arnold-manual-detention'
-        self.helper.layout = Layout(
-            'target', Submit('submit', 'Find', css_class='small')
+        self.attrs = set_flat_form_attributes(
+            form_action='arnold-manual-detention',
+            form_fields=[self['target']],
+            submit_field=SubmitField(value='Find', css_classes='small'),
         )
 
     def clean_target(self):
diff --git a/python/nav/web/templates/arnold/manualdetain.html b/python/nav/web/templates/arnold/manualdetain.html
index f1deaaf5dc..8612654555 100644
--- a/python/nav/web/templates/arnold/manualdetain.html
+++ b/python/nav/web/templates/arnold/manualdetain.html
@@ -1,5 +1,4 @@
 {% extends 'arnold/base.html' %}
-{% load crispy_forms_tags %}
 
 {% block content %}
 
@@ -13,7 +12,7 @@ <h4>Manual detention</h4>
 
   <div class="row">
     <div class="medium-4 column">
-      {% crispy form %}
+      {% include 'custom_crispy_templates/flat_form.html' %}
     </div>
   </div>