diff --git a/mcs/class/System.Core/System.IO.Pipes/NamedPipeClientStream.cs b/mcs/class/System.Core/System.IO.Pipes/NamedPipeClientStream.cs
index a27c4dc0b4d3..bd71ec318014 100644
--- a/mcs/class/System.Core/System.IO.Pipes/NamedPipeClientStream.cs
+++ b/mcs/class/System.Core/System.IO.Pipes/NamedPipeClientStream.cs
@@ -74,7 +74,7 @@ public NamedPipeClientStream (string serverName, string pipeName, PipeDirection
 		}
 
 		public NamedPipeClientStream (string serverName, string pipeName, PipeDirection direction, PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability)
-#if MOBILE
+#if MOBILE && !UNITY_AOT
 			: base (direction, DefaultBufferSize)
 		{
 			throw new NotImplementedException ();
@@ -88,13 +88,17 @@ public NamedPipeClientStream (string serverName, string pipeName, PipeDirection
 		public NamedPipeClientStream (PipeDirection direction, bool isAsync, bool isConnected, SafePipeHandle safePipeHandle)
 			: base (direction, DefaultBufferSize)
 		{
-#if MOBILE
+#if MOBILE && !UNITY_AOT
 			throw new NotImplementedException ();
 #else
 			if (IsWindows)
 				impl = new Win32NamedPipeClient (this, safePipeHandle);
 			else
+#if UNITY_AOT
+				throw new NotImplementedException ();
+#else
 				impl = new UnixNamedPipeClient (this, safePipeHandle);
+#endif
 			IsConnected = isConnected;
 			InitializeHandle (safePipeHandle, true, isAsync);
 #endif
@@ -106,13 +110,17 @@ public NamedPipeClientStream (string serverName, string pipeName, PipeAccessRigh
 			if (impersonationLevel != TokenImpersonationLevel.None ||
 			    inheritability != HandleInheritability.None)
 				throw ThrowACLException ();
-#if MOBILE
+#if MOBILE && !UNITY_AOT
 			throw new NotImplementedException ();
 #else
 			if (IsWindows)
 				impl = new Win32NamedPipeClient (this, serverName, pipeName, desiredAccessRights, options, inheritability);
 			else
+#if UNITY_AOT
+				throw new NotImplementedException ();
+#else
 				impl = new UnixNamedPipeClient (this, serverName, pipeName, desiredAccessRights, options, inheritability);
+#endif
 #endif
 
 		}
@@ -121,13 +129,13 @@ public NamedPipeClientStream (string serverName, string pipeName, PipeAccessRigh
 			Dispose (false);
 		}
 
-#if !MOBILE
+#if !MOBILE || UNITY_AOT
 		INamedPipeClient impl;
 #endif
 
 		public void Connect ()
 		{
-#if MOBILE
+#if MOBILE && !UNITY_AOT
 			throw new NotImplementedException ();
 #else
 			impl.Connect ();
@@ -138,7 +146,7 @@ public void Connect ()
 
 		public void Connect (int timeout)
 		{
-#if MOBILE
+#if MOBILE && !UNITY_AOT
 			throw new NotImplementedException ();
 #else			
 			impl.Connect (timeout);
@@ -174,7 +182,7 @@ protected override internal void CheckPipePropertyOperations () {
 		public int NumberOfServerInstances {
 			get {
 				CheckPipePropertyOperations ();
-#if MOBILE
+#if MOBILE && !UNITY_AOT
 				throw new NotImplementedException ();
 #else
 				return impl.NumberOfServerInstances;
diff --git a/mcs/class/System.Core/System.IO.Pipes/PipeStream.cs b/mcs/class/System.Core/System.IO.Pipes/PipeStream.cs
index 738342c76e88..52b0773020f1 100644
--- a/mcs/class/System.Core/System.IO.Pipes/PipeStream.cs
+++ b/mcs/class/System.Core/System.IO.Pipes/PipeStream.cs
@@ -46,7 +46,7 @@ public abstract class PipeStream : Stream
 		// FIXME: not precise.
 		internal const int DefaultBufferSize = 0x400;
 
-#if !MOBILE
+#if !MOBILE || UNITY_AOT
 		internal static bool IsWindows {
 			get { return Win32Marshal.IsWindows; }
 		}
diff --git a/mcs/class/System.Core/unityaot_System.Core.dll.sources b/mcs/class/System.Core/unityaot_System.Core.dll.sources
index 5ec6fe909185..4baa8f0c00b7 100644
--- a/mcs/class/System.Core/unityaot_System.Core.dll.sources
+++ b/mcs/class/System.Core/unityaot_System.Core.dll.sources
@@ -1,3 +1,4 @@
 #include winaot_System.Core.dll.sources
 ../referencesource/System.Core/System/Linq/Enumerable.cs
 corefx/SR.cs
+System.IO.Pipes/PipeWin32.cs