diff --git a/src/dotnet/FileSystem.cs b/src/dotnet/FileSystem.cs
index 0208405c..bf829a89 100644
--- a/src/dotnet/FileSystem.cs
+++ b/src/dotnet/FileSystem.cs
@@ -185,7 +185,8 @@ namespace Fsp
         }
         public String MountPoint()
         {
-            return IntPtr.Zero != _FileSystem ? Api.FspFileSystemMountPoint(_FileSystem) : null;
+            return IntPtr.Zero != _FileSystem ?
+                Marshal.PtrToStringUni(Api.FspFileSystemMountPoint(_FileSystem)) : null;
         }
         public IntPtr FileSystemHandle()
         {
diff --git a/src/dotnet/Interop.cs b/src/dotnet/Interop.cs
index e9096b65..e0928732 100644
--- a/src/dotnet/Interop.cs
+++ b/src/dotnet/Interop.cs
@@ -441,8 +441,7 @@ namespace Fsp.Interop
             internal delegate Int32 FspFileSystemStopDispatcher(
                 IntPtr FileSystem);
             [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-            [return: MarshalAs(UnmanagedType.LPWStr)]
-            internal delegate String FspFileSystemMountPointF(
+            internal delegate IntPtr FspFileSystemMountPointF(
                 IntPtr FileSystem);
             [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
             internal delegate void FspFileSystemSetOperationGuardStrategyF(