diff --git a/impact/entreprises/forms.py b/impact/entreprises/forms.py
index be169fa5a..29524314f 100644
--- a/impact/entreprises/forms.py
+++ b/impact/entreprises/forms.py
@@ -126,7 +126,7 @@ class EntrepriseQualificationForm(EntrepriseForm, forms.ModelForm):
     confirmation_naf = forms.CharField(
         label="Code NAF/APE",
         help_text="Merci de vérifier et confirmer le code APE de votre entreprise",
-        validators=[validators.RegexValidator(regex="^\d{2}\.\d{1,2}[A-Z]$")],
+        validators=[validators.RegexValidator(regex=r"^\d{2}\.\d{1,2}[A-Z]$")],
     )
 
     class Meta: