diff --git a/lib/ldb-samba/ldif_handlers.c b/lib/ldb-samba/ldif_handlers.c
index d9d799c..83f1599 100644
--- a/lib/ldb-samba/ldif_handlers.c
+++ b/lib/ldb-samba/ldif_handlers.c
@@ -133,7 +133,7 @@ bool ldif_comparision_objectSid_isString(const struct ldb_val *v)
 		return false;
 	}
 
-	if (strncmp("S-", (const char *)v->data, 2) != 0) return false;
+	if (strncasecmp("S-", (const char *)v->data, 2) != 0) return false;
 	
 	return true;
 }