diff --git a/include/rexy/hash.hpp b/include/rexy/hash.hpp
index 400f960..7507939 100644
--- a/include/rexy/hash.hpp
+++ b/include/rexy/hash.hpp
@@ -26,7 +26,7 @@ namespace rexy{
 
 	template<class T>
 	struct hash{
-		constexpr size_t operator()(const T& t, size_t salt)const noexcept{
+		constexpr size_t operator()(const T& t, size_t salt = 0)const noexcept{
 			constexpr size_t bytes = sizeof(size_t);
 			size_t val = static_cast<size_t>(t);
 			size_t hash = 5381 + salt; //magic hash number
diff --git a/include/rexy/string_hash.hpp b/include/rexy/string_hash.hpp
index b40594e..e22f300 100644
--- a/include/rexy/string_hash.hpp
+++ b/include/rexy/string_hash.hpp
@@ -27,7 +27,7 @@ namespace rexy{
 	//jenkns one at a time hash
 	template<class Str>
 	struct string_hash{
-		constexpr size_t operator()(const Str& s, size_t salt)const noexcept{
+		constexpr size_t operator()(const Str& s, size_t salt = 0)const noexcept{
 			size_t hash = salt;
 			for(size_t i = 0;i < s.length();++i){
 				hash += s[i];