diff --git a/htdocs/core/class/html.formother.class.php b/htdocs/core/class/html.formother.class.php
index 88a5a7522fe..d418a32fd77 100644
--- a/htdocs/core/class/html.formother.class.php
+++ b/htdocs/core/class/html.formother.class.php
@@ -330,7 +330,7 @@ class FormOther
         }
 
         // Print a select with each of them
-        $moreforfilter.='<select class="flat" id="select_categ_'.$htmlname.'" name="'.$htmlname.'"'.$nodatarole.'>';
+        $moreforfilter.='<select class="flat minwidth100" id="select_categ_'.$htmlname.'" name="'.$htmlname.'"'.$nodatarole.'>';
         $moreforfilter.='<option value="">&nbsp;</option>';	// Should use -1 to say nothing
 
         if (is_array($tab_categs))