diff --git a/AK/FlyString.h b/AK/FlyString.h
index 2db89366dfd..778d448b3d3 100644
--- a/AK/FlyString.h
+++ b/AK/FlyString.h
@@ -76,17 +76,13 @@ public:
 
     static void did_destroy_impl(Badge<StringImpl>, StringImpl&);
 
-    template<typename T, typename... Rest>
-    bool is_one_of(const T& string, Rest... rest) const
+    template<typename... Ts>
+    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
     {
-        if (*this == string)
-            return true;
-        return is_one_of(rest...);
+        return (... || this->operator==(forward<Ts>(strings)));
     }
 
 private:
-    bool is_one_of() const { return false; }
-
     RefPtr<StringImpl> m_impl;
 };
 
diff --git a/AK/String.h b/AK/String.h
index b1d453e60dc..6f9b98fdde7 100644
--- a/AK/String.h
+++ b/AK/String.h
@@ -282,17 +282,13 @@ public:
     Vector<size_t> find_all(const String& needle) const;
     [[nodiscard]] String reverse() const;
 
-    template<typename T, typename... Rest>
-    [[nodiscard]] bool is_one_of(const T& string, Rest... rest) const
+    template<typename... Ts>
+    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
     {
-        if (*this == string)
-            return true;
-        return is_one_of(rest...);
+        return (... || this->operator==(forward<Ts>(strings)));
     }
 
 private:
-    [[nodiscard]] bool is_one_of() const { return false; }
-
     RefPtr<StringImpl> m_impl;
 };
 
diff --git a/AK/StringView.h b/AK/StringView.h
index d7738f08ed7..78dfa8494da 100644
--- a/AK/StringView.h
+++ b/AK/StringView.h
@@ -209,17 +209,13 @@ public:
 
     [[nodiscard]] bool is_whitespace() const { return StringUtils::is_whitespace(*this); }
 
-    template<typename T, typename... Rest>
-    [[nodiscard]] bool is_one_of(const T& string, Rest... rest) const
+    template<typename... Ts>
+    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
     {
-        if (*this == string)
-            return true;
-        return is_one_of(rest...);
+        return (... || this->operator==(forward<Ts>(strings)));
     }
 
 private:
-    [[nodiscard]] bool is_one_of() const { return false; }
-
     friend class String;
     const char* m_characters { nullptr };
     size_t m_length { 0 };