diff --git a/Redcraft.Utility/Source/Public/Containers/Iterator.h b/Redcraft.Utility/Source/Public/Containers/Iterator.h
index feaf250..add1cab 100644
--- a/Redcraft.Utility/Source/Public/Containers/Iterator.h
+++ b/Redcraft.Utility/Source/Public/Containers/Iterator.h
@@ -424,8 +424,8 @@ public:
 	template <CCommonType<IteratorType> J>
 	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, const TCountedIterator<J>& RHS) { LHS.CheckThis(); RHS.CheckThis(); return LHS.Length - RHS.Length; }
 
-	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, FDefaultSentinel) { CheckThis(); return -LHS.Num(); }
-	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(FDefaultSentinel, const TCountedIterator& RHS) { CheckThis(); return  RHS.Num(); }
+	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, FDefaultSentinel) { LHS.CheckThis(); return -LHS.Num(); }
+	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(FDefaultSentinel, const TCountedIterator& RHS) { RHS.CheckThis(); return  RHS.Num(); }
 
 	NODISCARD FORCEINLINE constexpr explicit operator TObserverPtr<ElementType[]>() const requires (CContiguousIterator<IteratorType>) { CheckThis(); return TObserverPtr<ElementType[]>(Current); }
 
diff --git a/Redcraft.Utility/Source/Public/Miscellaneous/ConstantIterator.h b/Redcraft.Utility/Source/Public/Miscellaneous/ConstantIterator.h
index 2abb58b..a587f94 100644
--- a/Redcraft.Utility/Source/Public/Miscellaneous/ConstantIterator.h
+++ b/Redcraft.Utility/Source/Public/Miscellaneous/ConstantIterator.h
@@ -176,8 +176,8 @@ public:
 	template <CCommonType<IteratorType> J>
 	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, const TCountedIterator<J>& RHS) { LHS.CheckThis(); RHS.CheckThis(); return LHS.Length - RHS.Length; }
 
-	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, FDefaultSentinel) { CheckThis(); return -LHS.Num(); }
-	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(FDefaultSentinel, const TCountedIterator& RHS) { CheckThis(); return  RHS.Num(); }
+	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, FDefaultSentinel) { LHS.CheckThis(); return -LHS.Num(); }
+	NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(FDefaultSentinel, const TCountedIterator& RHS) { RHS.CheckThis(); return  RHS.Num(); }
 
 	NODISCARD FORCEINLINE constexpr const IteratorType& GetBase() const& { CheckThis(); return Current; }
 	NODISCARD FORCEINLINE constexpr       IteratorType  GetBase() &&     { CheckThis(); return Current; }
@@ -204,6 +204,7 @@ private:
 };
 
 static_assert(CRandomAccessIterator<TCountedIterator<TConstantIterator<int>>>);
+static_assert(CSizedSentinelFor<FDefaultSentinel, TCountedIterator<TConstantIterator<int>>>);
 
 template <typename T> requires (CDestructible<T> || CLValueReference<T>)
 NODISCARD FORCEINLINE constexpr auto MakeConstantIterator(T&& Value)