diff --git a/csharp/Platform.Numbers/Bit[T].cs b/csharp/Platform.Numbers/Bit[T].cs
index 8e8b752..ec6ee07 100644
--- a/csharp/Platform.Numbers/Bit[T].cs
+++ b/csharp/Platform.Numbers/Bit[T].cs
@@ -26,11 +26,11 @@ public static T PartialWrite(T target, T source, int shift, int limit)
         {
             if (shift < 0)
             {
-                shift = 32 + shift;
+                shift = BitsSize + shift;
             }
             if (limit < 0)
             {
-                limit = 32 + limit;
+                limit = BitsSize + limit;
             }
             var sourceMask = ~(T.MaxValue << limit) & T.MaxValue;
             var targetMask = ~(sourceMask << shift);
@@ -40,11 +40,11 @@ public static T PartialRead(T target, int shift, int limit)
         {
             if (shift < 0)
             {
-                shift = 32 + shift;
+                shift = BitsSize + shift;
             }
             if (limit < 0)
             {
-                limit = 32 + limit;
+                limit = BitsSize + limit;
             }
             var sourceMask = ~(T.MaxValue << limit) & T.MaxValue;
             var targetMask = sourceMask << shift;