diff -u b/core/modules/views/templates/views-view-fields.html.twig b/core/modules/views/templates/views-view-fields.html.twig
--- b/core/modules/views/templates/views-view-fields.html.twig
+++ b/core/modules/views/templates/views-view-fields.html.twig
@@ -41,9 +41,9 @@
   {%- endif %}
   {%- if field.label -%}
     {%- if field.label_element -%}
-      <{{ field.label_element }}{{ field.label_attributes }}>{{ field.label }}{% if field.has_label_colon %} :{% endif %}</{{ field.label_element }}>
+      <{{ field.label_element }}{{ field.label_attributes }}>{{ field.label }}{{ field.has_label_colon ? ': ' }}</{{ field.label_element }}>
     {%- else -%}
-      {{ field.label }}{% if field.has_label_colon %} :{% endif %}
+      {{ field.label }}{{ field.has_label_colon ? ': ' }}
     {%- endif %}
   {%- endif %}
   {%- if field.element_type -%}
diff -u b/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
--- b/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -209,7 +209,7 @@
         $output .= '<' . $label_element . $field->label_attributes . '>';
       }
       $output .= Html::escape($field->label);
-      if (isset($field->has_label_colon) && $field->has_label_colon) {
+      if ($field->has_label_colon) {
         $output .= ': ';
       }
       if (isset($label_element)) {