diff --git a/src/dotnet/FileSystemHost.cs b/src/dotnet/FileSystemHost.cs
index 03d0013f..6a0a65dd 100644
--- a/src/dotnet/FileSystemHost.cs
+++ b/src/dotnet/FileSystemHost.cs
@@ -203,6 +203,11 @@ namespace Fsp
             get { return 0 != (_VolumeParams.Flags & VolumeParams.FlushAndPurgeOnCleanup); }
             set { _VolumeParams.Flags |= (value ? VolumeParams.FlushAndPurgeOnCleanup : 0); }
         }
+        public Boolean DeviceControl
+        {
+            get { return 0 != (_VolumeParams.Flags & VolumeParams.DeviceControl); }
+            set { _VolumeParams.Flags |= (value ? VolumeParams.DeviceControl : 0); }
+        }
         /// <summary>
         /// Gets or sets the prefix for a network file system.
         /// </summary>
diff --git a/src/dotnet/Interop.cs b/src/dotnet/Interop.cs
index 63523990..90ea664b 100644
--- a/src/dotnet/Interop.cs
+++ b/src/dotnet/Interop.cs
@@ -48,6 +48,7 @@ namespace Fsp.Interop
         internal const UInt32 AlwaysUseDoubleBuffering = 0x00001000;
         internal const UInt32 PassQueryDirectoryFileName = 0x00002000;
         internal const UInt32 FlushAndPurgeOnCleanup = 0x00004000;
+        internal const UInt32 DeviceControl = 0x00008000;
         internal const UInt32 UmFileContextIsUserContext2 = 0x00010000;
         internal const UInt32 UmFileContextIsFullContext = 0x00020000;
         internal const int PrefixSize = 192;