diff --git a/passerelle_imio_liege_lisrue/models.py b/passerelle_imio_liege_lisrue/models.py
index 6923f39..50bdc71 100644
--- a/passerelle_imio_liege_lisrue/models.py
+++ b/passerelle_imio_liege_lisrue/models.py
@@ -19,6 +19,7 @@ import unicodedata
 import requests
 
 from django.db import models
+from django.utils.encoding import force_str
 from django.utils.translation import ugettext_lazy as _
 from passerelle.base.models import BaseResource
 from passerelle.utils.api import endpoint
@@ -82,9 +83,9 @@ class ImioLiegeLisrue(BaseResource):
                 # url += "jsonlisrue2"
                 url += "jsonlgrue12/"
         if q:
-            q = unicodedata.normalize("NFKD", request.GET["q"]).encode(
+            q = force_str(unicodedata.normalize("NFKD", request.GET["q"]).encode(
                 "ascii", "ignore"
-            )
+            ))
             url += q.lower()
         result = requests.get(
             url, headers={"Accept": "application/json"}, verify=self.verify_cert
@@ -168,9 +169,9 @@ class ImioLiegeLisrue(BaseResource):
         else:
             url = self.service_url
             url = "{}?outSrid=31370".format(url)
-            q = unicodedata.normalize("NFKD", request.GET["q"]).encode(
+            q = force_str(unicodedata.normalize("NFKD", request.GET["q"]).encode(
                 "ascii", "ignore"
-            )
+            ))
             url = "{}&q={}".format(url, q.lower())
 
             result = requests.get(