diff --git a/src/Common/src/System/Net/Security/NegotiateStreamPal.Unix.cs b/src/Common/src/System/Net/Security/NegotiateStreamPal.Unix.cs
index 948ae79325df..bec9e8fd7f33 100644
--- a/src/Common/src/System/Net/Security/NegotiateStreamPal.Unix.cs
+++ b/src/Common/src/System/Net/Security/NegotiateStreamPal.Unix.cs
@@ -263,7 +263,11 @@ Interop.NetSecurityNative.Status status
                     tokenBytes = tokenBytes.Slice(0, length - 1);
                 }
 
+#if NETSTANDARD2_0
+                return Encoding.UTF8.GetString(tokenBytes.ToArray(), 0, tokenBytes.Length);
+#else
                 return Encoding.UTF8.GetString(tokenBytes);
+#endif
             }
             finally
             {