diff --git a/libraries/structure.lib.php b/libraries/structure.lib.php
index ee742b875d..327fb7752e 100644
--- a/libraries/structure.lib.php
+++ b/libraries/structure.lib.php
@@ -1695,6 +1695,7 @@ function PMA_getHtmlForAddColumn($columns_list)
             'b_insrow.png',
             __('Add column')
         );
+        $html_output .= ' ';
     }
     $num_fields = '<input type="number" name="num_fields" '
         . 'value="1" onfocus="this.select()" '