diff --git a/Contexts/ImpersonationHandle.cs b/Contexts/ImpersonationHandle.cs
index 752e665..56ff7aa 100644
--- a/Contexts/ImpersonationHandle.cs
+++ b/Contexts/ImpersonationHandle.cs
@@ -24,6 +24,7 @@ namespace NSspi.Contexts
         internal ImpersonationHandle(ServerContext server)
         {
             this.server = server;
+            this.disposed = false;
         }
 
         ~ImpersonationHandle()
@@ -39,7 +40,7 @@ namespace NSspi.Contexts
 
         protected virtual void Dispose( bool disposing )
         {
-            if( disposing && this.server != null && this.server.Disposed == false )
+            if( disposing && this.disposed == false && this.server != null && this.server.Disposed == false )
             {
                 this.server.RevertImpersonate();
             }