diff --git a/modoboa/extensions/amavis/forms.py b/modoboa/extensions/amavis/forms.py
index 1f9a270ad..ae58d3db3 100644
--- a/modoboa/extensions/amavis/forms.py
+++ b/modoboa/extensions/amavis/forms.py
@@ -15,9 +15,9 @@ class DomainPolicyForm(forms.ModelForm):
         widgets = {
             'bypass_virus_checks': InlineRadioSelect(),
             'bypass_spam_checks': InlineRadioSelect(),
-            'spam_tag2_level': forms.TextInput(attrs={'class': 'span1'}),
-            'spam_kill_level': forms.TextInput(attrs={'class': 'span1'}),
-            'spam_subject_tag2': forms.TextInput(attrs={'class': 'span2'}),
+            'spam_tag2_level': forms.TextInput(attrs={'class': 'col-md-1 form-control'}),
+            'spam_kill_level': forms.TextInput(attrs={'class': 'col-md-1 form-control'}),
+            'spam_subject_tag2': forms.TextInput(attrs={'class': 'col-md-2 form-control'}),
             'bypass_banned_checks': InlineRadioSelect(),
         }