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Diffstat (limited to 'crypto/src/util/io/Streams.cs')
-rw-r--r--crypto/src/util/io/Streams.cs6
1 files changed, 5 insertions, 1 deletions
diff --git a/crypto/src/util/io/Streams.cs b/crypto/src/util/io/Streams.cs
index 69f390646..a1a2ea5d1 100644
--- a/crypto/src/util/io/Streams.cs
+++ b/crypto/src/util/io/Streams.cs
@@ -2,13 +2,15 @@ using System;
 using System.IO;
 using System.Runtime.InteropServices;
 using System.Threading;
+#if NETCOREAPP1_0_OR_GREATER || NET45_OR_GREATER || NETSTANDARD1_0_OR_GREATER
 using System.Threading.Tasks;
+#endif
 
 namespace Org.BouncyCastle.Utilities.IO
 {
     public static class Streams
 	{
-        private static readonly int MaxStackAlloc = Environment.Is64BitProcess ? 4096 : 1024;
+        private static readonly int MaxStackAlloc = Platform.Is64BitProcess ? 4096 : 1024;
 
 		public static int DefaultBufferSize => MaxStackAlloc;
 
@@ -37,6 +39,7 @@ namespace Org.BouncyCastle.Utilities.IO
 #endif
 		}
 
+#if NETCOREAPP1_0_OR_GREATER || NET45_OR_GREATER || NETSTANDARD1_0_OR_GREATER
         public static Task CopyToAsync(Stream source, Stream destination)
         {
             return CopyToAsync(source, destination, DefaultBufferSize);
@@ -69,6 +72,7 @@ namespace Org.BouncyCastle.Utilities.IO
 			}
 #endif
 		}
+#endif
 
         public static void Drain(Stream inStr)
 		{