diff --git a/export/supervisor_excel.php b/export/supervisor_excel.php
index d7ff65f..359d27c 100644
--- a/export/supervisor_excel.php
+++ b/export/supervisor_excel.php
@@ -21,7 +21,7 @@ $profesor_clave = isset($params['profesor'])
     : null;
 
 $data = $db->query(
-    "SELECT 
+    "SELECT DISTINCT
         auditoria->>'registro_fecha_ideal' as registro_fecha_ideal,
         auditoria->>'profesor_clave' as profesor_clave,
         auditoria->>'profesor_nombre' as profesor_nombre,