diff --git a/attributs.py b/attributs.py
index 8cafe53..8f766b7 100644
--- a/attributs.py
+++ b/attributs.py
@@ -267,7 +267,7 @@ class solde(Attr):
 
     def parse_value(self, solde, ldif):
         # on évite les dépassements
-        if float(solde) >= config.impression.decouvert and float(solde) <= 1024.:
+        if not (float(solde) >= config.impression.decouvert and float(solde) <= 1024.):
             raise ValueError("Solde invalide: %s" % solde)
         self.value = solde