diff --git a/Userland/Utilities/sort.cpp b/Userland/Utilities/sort.cpp
index 5827bfea377..76a76825894 100644
--- a/Userland/Utilities/sort.cpp
+++ b/Userland/Utilities/sort.cpp
@@ -42,7 +42,7 @@ private:
 
 template<>
 struct AK::Traits<Line> : public DefaultTraits<Line> {
-    static unsigned hash(Line l)
+    static unsigned hash(Line const& l)
     {
         if (l.numeric)
             return l.numeric_key;