diff --git a/Program.cs b/Program.cs
index 4b1d7f6..ea19381 100644
--- a/Program.cs
+++ b/Program.cs
@@ -787,7 +787,7 @@ sealed class SspiProxyAuthenticator : IDisposable
                         inDescPtr,
                         0,
                         out _ctx,
-                        out outDesc,
+                        ref outDesc,
                         out attrs,
                         out expiry);
                 }
@@ -803,7 +803,7 @@ sealed class SspiProxyAuthenticator : IDisposable
                         inDescPtr,
                         0,
                         out _ctx,
-                        out outDesc,
+                        ref outDesc,
                         out attrs,
                         out expiry);
                 }
@@ -888,7 +888,7 @@ sealed class SspiProxyAuthenticator : IDisposable
         IntPtr pInput,
         int Reserved2,
         out SecHandle phNewContext,
-        out SecBufferDesc pOutput,
+        ref SecBufferDesc pOutput,
         out uint pfContextAttr,
         out FILETIME ptsExpiry);
 
@@ -903,7 +903,7 @@ sealed class SspiProxyAuthenticator : IDisposable
         IntPtr pInput,
         int Reserved2,
         out SecHandle phNewContext,
-        out SecBufferDesc pOutput,
+        ref SecBufferDesc pOutput,
         out uint pfContextAttr,
         out FILETIME ptsExpiry);