diff --git a/templates/page/_desktop_menu.html.ep b/templates/page/_desktop_menu.html.ep
index 33c4013..ccdeaa1 100644
--- a/templates/page/_desktop_menu.html.ep
+++ b/templates/page/_desktop_menu.html.ep
@@ -2,7 +2,11 @@
 % my $current_category_slug = stash 'current_category_slug';
 <nav class="desktop"><%
 my @sorted_categories = sort {
-        $categories->{$a}{priority} <=> $categories->{$b}{priority} 
+        my $result = $categories->{$a}{priority} <=> $categories->{$b}{priority};
+        if ($result == 0) {
+            $result = $categories->{$a}{slug} cmp $categories->{$b}{slug};
+        }
+        $result;
 } keys %$categories;
 my $target_category_slug = $current_category_slug;
 my $current_category = $categories->{$current_category_slug};