diff --git a/users/forms.py b/users/forms.py
index ca01c52d..81c31cae 100644
--- a/users/forms.py
+++ b/users/forms.py
@@ -368,6 +368,7 @@ class AdherentForm(FormRevMixin, FieldPermissionFormMixin, ModelForm):
             remove_user_room(self.cleaned_data.get('room'))
         return
 
+
 class AdherentCreationForm(AdherentForm):
     """Formulaire de création d'un user.
     AdherentForm auquel on ajoute une checkbox afin d'éviter les
@@ -398,12 +399,6 @@ class AdherentEditForm(AdherentForm):
        if 'shell' in self.fields:
            self.fields['shell'].empty_label = _("Default shell")
 
-    def clean_gpg_fingerprint(self):
-        """Format the GPG fingerprint"""
-        gpg_fingerprint = self.cleaned_data.get('gpg_fingerprint', None)
-        if gpg_fingerprint:
-            return gpg_fingerprint.replace(' ', '').upper()
-
     class Meta:
         model = Adherent
         fields = [
diff --git a/users/migrations/0079_auto_20181228_2039.py b/users/migrations/0079_auto_20181228_2039.py
new file mode 100644
index 00000000..79ab56d9
--- /dev/null
+++ b/users/migrations/0079_auto_20181228_2039.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-12-28 19:39
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0078_auto_20181011_1405'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='adherent',
+            name='gpg_fingerprint',
+            field=models.CharField(blank=True, max_length=49, null=True),
+        ),
+    ]
diff --git a/users/models.py b/users/models.py
index 9f17615d..b8f79942 100755
--- a/users/models.py
+++ b/users/models.py
@@ -1053,20 +1053,27 @@ class Adherent(User):
         null=True
     )
     gpg_fingerprint = models.CharField(
-        max_length=40,
+        max_length=49,
         blank=True,
         null=True,
-        validators=[RegexValidator(
-            '^[0-9A-F]{40}$',
-            message=_("A GPG fingerprint must contain 40 hexadecimal"
-                      " characters.")
-        )]
     )
 
     class Meta(User.Meta):
         verbose_name = _("member")
         verbose_name_plural = _("members")
 
+    def format_gpgfp(self):
+        """Format gpg finger print as AAAA BBBB... from a string AAAABBBB...."""
+        self.gpg_fingerprint = ' '.join([self.gpg_fingerprint[i:i + 4] for i in range(0, len(self.gpg_fingerprint), 4)])
+
+    def validate_gpgfp(self):
+        """Validate from raw entry if is it a valid gpg fp"""
+        if self.gpg_fingerprint:
+            gpg_fingerprint = self.gpg_fingerprint.replace(' ', '').upper()
+            if not re.compile("^[0-9A-F]{40}$").match(gpg_fingerprint):
+                raise ValidationError(_("A gpg fingerprint must contain 40 hexadecimal carracters"))
+            self.gpg_fingerprint = gpg_fingerprint
+
     @classmethod
     def get_instance(cls, adherentid, *_args, **_kwargs):
         """Try to find an instance of `Adherent` with the given id.
@@ -1097,6 +1104,13 @@ class Adherent(User):
                     _("You don't have the right to create a user.")
                 )
 
+    def clean(self, *args, **kwargs):
+        """Format the GPG fingerprint"""
+        super(Adherent, self).clean(*args, **kwargs)
+        if self.gpg_fingerprint:
+            self.validate_gpgfp()
+            self.format_gpgfp()
+
 
 class Club(User):
     """ A class representing a club (it is considered as a user