diff --git a/registration/forms.py b/registration/forms.py
index 60b1ca12..11d66f51 100644
--- a/registration/forms.py
+++ b/registration/forms.py
@@ -1,4 +1,5 @@
 from django import forms
+from django.contrib.auth.models import User
 
 
 class RegistrationForm(forms.Form):
@@ -12,6 +13,13 @@ class RegistrationForm(forms.Form):
         if ' ' in self.cleaned_data['username']:
             raise forms.ValidationError(u'Username can not contain a space')
 
+        # We attempt to get the user object if we succeed we know email as been used
+        try:
+            User.objects.get(email=self.cleaned_data['email'])
+            raise forms.ValidationError(u'Email as already been used')
+        except:
+            pass
+
         if 'password' in self.cleaned_data and 'password_again' in self.cleaned_data:
             if self.cleaned_data['password'] != self.cleaned_data['password_again']:
                 raise forms.ValidationError(u'Passwords do not match')