diff --git a/abonapp/forms.py b/abonapp/forms.py
index a253024..4d3e3e0 100644
--- a/abonapp/forms.py
+++ b/abonapp/forms.py
@@ -76,7 +76,7 @@ class AbonForm(forms.ModelForm):
 
 
 class Opt82Form(forms.ModelForm):
-    mac = MACAddressField(widget=forms.TextInput(attrs={'class': 'form-control', 'pattern': r'^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$', 'required': ''}))
+    mac = MACAddressField(widget=forms.TextInput(attrs={'class': 'form-control', 'pattern': r'^([0-9A-Fa-f]{2}[:]){5}([0-9A-Fa-f]{2})$', 'required': ''}))
     class Meta:
         model = models.Opt82
         fields = '__all__'