diff --git a/core/themes/classy/templates/field/field--node--uid.html.twig b/core/themes/classy/templates/field/field--node--uid.html.twig
index a31f2b8..9afc591 100644
--- a/core/themes/classy/templates/field/field--node--uid.html.twig
+++ b/core/themes/classy/templates/field/field--node--uid.html.twig
@@ -22,7 +22,7 @@
 {%
   set classes = [
     'field',
-    'field--name-' ~ field_name_class,
+    'field--name-' ~ field_name|clean_class,
     'field--type-' ~ field_type|clean_class,
     'field--label-' ~ label_display,
   ]