diff --git a/src/common/u128.h b/src/common/u128.h
index 401c608f..867ac1dd 100644
--- a/src/common/u128.h
+++ b/src/common/u128.h
@@ -24,7 +24,7 @@ struct u128 {
 
     u128(u64 lower_, u64 upper_) : lower(lower_), upper(upper_) {}
 
-    template <typename T>
+    template<typename T>
     /* implicit */ u128(T value) : lower(value), upper(0) {
         static_assert(std::is_integral_v<T>);
         static_assert(Common::BitSize<T>() <= Common::BitSize<u64>());
@@ -32,6 +32,16 @@ struct u128 {
 
     u64 lower = 0;
     u64 upper = 0;
+
+    template<size_t bit_position>
+    bool Bit() {
+        static_assert(bit_position < 128);
+        if constexpr (bit_position < 64) {
+            return Common::Bit<bit_position>(lower);
+        } else {
+            return Common::Bit<bit_position - 64>(upper);
+        }
+    }
 };
 
 static_assert(Common::BitSize<u128>() == 128);