1 files changed, 5 insertions, 1 deletions
diff --git a/include/chilbert/detail/MultiBitVec.hpp b/include/chilbert/detail/MultiBitVec.hpp
index bf1802c..1317d3b 100644
--- a/include/chilbert/detail/MultiBitVec.hpp
+++ b/include/chilbert/detail/MultiBitVec.hpp
@@ -111,7 +111,7 @@ public:
   /// Clear any bits in storage outside the valid range if necessary
   void truncate()
   {
-    if (const auto pad = num_racks() * bits_per_rack - size()) {
+    if (const auto pad = (num_racks() * bits_per_rack) - size()) {
       rack(num_racks() - 1) &= ~Rack{0} >> pad;
     }
   }
@@ -334,6 +334,10 @@ public:
 private:
   using Index = detail::BitVecIndex<Derived>;
 
+  friend Derived;
+
+  MultiBitVec() = default;
+
   Derived*       self() { return static_cast<Derived*>(this); }
   const Derived* self() const { return static_cast<const Derived*>(this); }
 };