diff --git a/mod/glossary/lib.php b/mod/glossary/lib.php
index 205297b6946..1858c7b52be 100644
--- a/mod/glossary/lib.php
+++ b/mod/glossary/lib.php
@@ -1951,7 +1951,7 @@ function glossary_print_categories_menu($cm, $glossary, $hook, $category) {
             echo get_string("entrieswithoutcategory","glossary");
             $selected = GLOSSARY_SHOW_NOT_CATEGORISED;
 
-        } elseif ( $hook == GLOSSARY_SHOW_ALL_CATEGORIES ) {
+        } else if ( empty($hook) ) {
 
             echo get_string("allcategories","glossary");
             $selected = GLOSSARY_SHOW_ALL_CATEGORIES;