diff --git a/AK/BinarySearch.h b/AK/BinarySearch.h
index b8defdacb4a..f5e8f666cf3 100644
--- a/AK/BinarySearch.h
+++ b/AK/BinarySearch.h
@@ -13,7 +13,7 @@ namespace AK {
 
 struct DefaultComparator {
     template<typename T, typename S>
-    constexpr int operator()(T& lhs, S& rhs)
+    [[nodiscard]] constexpr int operator()(T& lhs, S& rhs)
     {
         if (lhs > rhs)
             return 1;