diff --git a/obfuscator.hpp b/obfuscator.hpp
index 0823a01..e004671 100644
--- a/obfuscator.hpp
+++ b/obfuscator.hpp
@@ -67,6 +67,8 @@ namespace obfs {
         using value = TypeVal<T, Val>;
         using next = Sequence<T, Others...>;
 
+        constexpr static std::size_t size = 1 + sizeof...(Others);
+
         template <std::size_t Idx>
         using index = std::conditional_t<Idx == 0, value, typename next::template index<Idx - 1>>;
     };
@@ -75,6 +77,8 @@ namespace obfs {
     struct Sequence<T, Val> {
         using value = TypeVal<T, Val>;
 
+        constexpr static std::size_t size = 1;
+
         template <std::size_t Idx>
         using index = std::conditional_t<Idx == 0, value, Nothing>;
     };
@@ -96,9 +100,21 @@ namespace obfs {
         using index = std::conditional_t<Idx == 0, type, Nothing>;
     };
 
+    template <std::size_t Val, std::size_t... Others>
+    struct MinVal {
+        constexpr static std::size_t value = 
+            Val < MinVal<Others...>::value ? Val : MinVal<Others...>::value;
+    };
+
+    template <std::size_t Val>
+    struct MinVal<Val> {
+        constexpr static std::size_t value = Val;
+    };
+
     template <typename... T>
     struct SeqPack {
         constexpr static std::size_t size = sizeof...(T);
+        constexpr static std::size_t elem_size = MinVal<T::size...>::value;
 
         template <std::size_t Idx, typename U>
         using getter = typename U::template index<Idx>;
@@ -150,7 +166,7 @@ namespace obfs {
 
     template <typename Table, std::size_t size>
     constexpr auto make_string(char const (&str)[size]) {
-        using pair = typename Table::template index<MAKE_RAND_VAL(Table::size)>;
+        using pair = typename Table::template index<MAKE_RAND_VAL(Table::elem_size)>;
         constexpr Encoder encoder = pair::template index<0>::value;
         constexpr Decoder decoder = pair::template index<1>::value;