diff --git a/gestion/gest_crans.py b/gestion/gest_crans.py
index 3fa05767..4373285d 100755
--- a/gestion/gest_crans.py
+++ b/gestion/gest_crans.py
@@ -1937,7 +1937,7 @@ def select(clas, quoi, mde=''):
         filtre_adher = u'nom=%s&prenom=%s&tel=%s&chbre=%s&aid=%s&mail=%s&' % tuple(s[:6])
         filtre_machine = u'host=%s&macAddress=%s&ipHostNumber=%s&mid=%s&' % tuple(s[6:])
 
-        filtre= ''
+        filtre = u''
         if filtre_adher.count('=*&') != 6:
             # Au moins une condition adhérent
             filtre += filtre_adher[:-1]
@@ -1951,7 +1951,7 @@ def select(clas, quoi, mde=''):
             arg += u'--msgbox "Il faut au moins une condition.\n\n\n" 0 0'
             dialog(arg)
             continue
-
+        
         ### Recherche
         try:
             if mde == 'ro':
diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 0554e85c..764692d4 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -684,18 +684,18 @@ class CransLdap:
         Si mode='w', les instances crées seront en mode d'écriture
         """
 
+        if isinstance(expression, str):
+            pass
+        elif isinstance(expression, unicode):
+            expression = expression.encode('utf-8')
+        else:
+            raise TypeError(u'Chaîne attendue')
+
         if os.getuid() != 0:
             openlog('CransLdap.search')
             syslog('(%s,%s) %s' % (script_utilisateur, mode, expression))
             closelog()
 
-        if type(expression) == str:
-            pass
-        elif type(expression) == unicode:
-            expression = expression.encode('utf-8')
-        else:
-            raise TypeError(u'Chaîne attendue')
-
         if not expression:
             return []