1 files changed, 15 insertions, 5 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Number.NumberBuffer.cs b/src/System.Private.CoreLib/shared/System/Number.NumberBuffer.cs
index 2316f99bd..1730cf18f 100644
--- a/src/System.Private.CoreLib/shared/System/Number.NumberBuffer.cs
+++ b/src/System.Private.CoreLib/shared/System/Number.NumberBuffer.cs
@@ -15,17 +15,27 @@ namespace System
         [StructLayout(LayoutKind.Sequential, Pack = 1)]
         internal unsafe ref struct NumberBuffer // needs to match layout of NUMBER in coreclr's src/classlibnative/bcltype/number.h
         {
-            public int precision;
-            public int scale;
-            private int _sign;
-            private DigitsAndNullTerminator _digits;
-            private char* _allDigits;
+            public int precision;                       //  0
+            public int scale;                           //  4
+            private int _sign;                          //  8
+            private NumberBufferKind _kind;             // 12
+            private char* _allDigits;                   // 16
+            private DigitsAndNullTerminator _digits;    // 20 or 24
 
             public bool sign { get => _sign != 0; set => _sign = value ? 1 : 0; }
             public char* digits => (char*)Unsafe.AsPointer(ref _digits);
+            public NumberBufferKind kind { get => _kind; set => _kind = value; }
 
             [StructLayout(LayoutKind.Sequential, Size = (NumberMaxDigits + 1) * sizeof(char))]
             private struct DigitsAndNullTerminator { }
         }
+
+        internal enum NumberBufferKind // needs to match NUMBER_KIND in coreclr's src/classlibnative/bcltype/number.h
+        {
+            Unknown = 0,
+            Integer = 1,
+            Decimal = 2,
+            Double = 3
+        }
     }
 }