diff --git a/include/xxhash_str.h b/include/xxhash_str.h
index 0f93cb0..a83321a 100644
--- a/include/xxhash_str.h
+++ b/include/xxhash_str.h
@@ -6,4 +6,5 @@ struct xxHashStringGen
 {
     XXH64_hash_t operator()(const std::string &str) const noexcept;
     XXH64_hash_t operator()(std::string_view &&str) const noexcept;
+    XXH64_hash_t operator()(std::string &&str) const noexcept;
 };
diff --git a/src/xxhash_str.cpp b/src/xxhash_str.cpp
index 3a984aa..0917e48 100644
--- a/src/xxhash_str.cpp
+++ b/src/xxhash_str.cpp
@@ -5,6 +5,10 @@ XXH64_hash_t xxHashStringGen::operator()(const std::string &str) const noexcept
     return XXH3_64bits(str.data(), str.size());
 }
 XXH64_hash_t xxHashStringGen::operator()(std::string_view &&str) const noexcept
+{
+    return XXH3_64bits(str.data(), str.size());
+}
+XXH64_hash_t xxHashStringGen::operator()(std::string &&str) const noexcept
 {
     return XXH3_64bits(str.data(), str.size());
 }
\ No newline at end of file