diff --git a/kfet/forms.py b/kfet/forms.py
index d2b0cfef..acab8df6 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -55,6 +55,11 @@ class AccountForm(forms.ModelForm):
         }
 
 class AccountTriForm(AccountForm):
+
+    def clean_trigramme(self):
+        trigramme = self.cleaned_data['trigramme']
+        return trigramme.upper()
+
     class Meta(AccountForm.Meta):
         fields = ['trigramme']