diff --git a/xmlschemas.c b/xmlschemas.c
index ddb31d67..5a5b41ec 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -13946,7 +13946,7 @@ xmlSchemaCheckCOSNSSubset(xmlSchemaWildcardPtr sub,
     */
     if ((sub->negNsSet != NULL) &&
 	(super->negNsSet != NULL) &&
-	(sub->negNsSet->value == sub->negNsSet->value))
+	(sub->negNsSet->value == super->negNsSet->value))
 	return (0);
     /*
     * 3.1 sub must be a set whose members are either namespace names or �absent�.