diff --git a/sao/src/sao.less b/sao/src/sao.less
index bf4360d823..2b4fa10ba5 100644
--- a/sao/src/sao.less
+++ b/sao/src/sao.less
@@ -656,7 +656,7 @@ img.icon {
             min-width: 8ch;
         }
     }
-    .form-many2one, .form-one2one, .form-reference, form-binary {
+    .form-many2one, .form-one2one, .form-reference, .form-binary {
         select {
             min-width: 8ch;
         }