diff --git a/AK/String.h b/AK/String.h
index d59b00c3b09..79f66347bb0 100644
--- a/AK/String.h
+++ b/AK/String.h
@@ -287,7 +287,7 @@ public:
     [[nodiscard]] String reverse() const;
 
     template<typename... Ts>
-    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
+    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts&&... strings) const
     {
         return (... || this->operator==(forward<Ts>(strings)));
     }
diff --git a/AK/StringView.h b/AK/StringView.h
index 2d03af4eace..519e5afdf8a 100644
--- a/AK/StringView.h
+++ b/AK/StringView.h
@@ -216,7 +216,7 @@ public:
     [[nodiscard]] bool is_whitespace() const { return StringUtils::is_whitespace(*this); }
 
     template<typename... Ts>
-    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
+    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts&&... strings) const
     {
         return (... || this->operator==(forward<Ts>(strings)));
     }