Add `using System.Diagnostics.Private;` to Decimal

2 files changed, 4 insertions, 0 deletions

diff --git a/src/System.Private.CoreLib/src/System/Decimal.DecCalc.cs b/src/System.Private.CoreLib/src/System/Decimal.DecCalc.cs
index 05afe6b7e..c14603d45 100644
--- a/src/System.Private.CoreLib/src/System/Decimal.DecCalc.cs
+++ b/src/System.Private.CoreLib/src/System/Decimal.DecCalc.cs
@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System.Diagnostics;
+using System.Diagnostics.Private;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
diff --git a/src/System.Private.CoreLib/src/System/Decimal.cs b/src/System.Private.CoreLib/src/System/Decimal.cs
index 244ef6223..8bf8094f3 100644
--- a/src/System.Private.CoreLib/src/System/Decimal.cs
+++ b/src/System.Private.CoreLib/src/System/Decimal.cs
@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System.Diagnostics;
+using System.Diagnostics.Private;
 using System.Globalization;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -54,7 +55,9 @@ namespace System
     // the range of the Decimal type.
     [Serializable]
     [StructLayout(LayoutKind.Explicit)]
+#if !MONO
     [System.Runtime.CompilerServices.TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
+#endif
     public partial struct Decimal : IFormattable, IComparable, IConvertible, IComparable<Decimal>, IEquatable<Decimal>, IDeserializationCallback, ISpanFormattable
     {
         // Sign mask for the flags field. A value of zero in this bit indicates a