diff --git a/src/powershell-native/nativemsh/pwrshcommon/pwrshcommon.cpp b/src/powershell-native/nativemsh/pwrshcommon/pwrshcommon.cpp
index 23e6fcf..5469a69 100644
--- a/src/powershell-native/nativemsh/pwrshcommon/pwrshcommon.cpp
+++ b/src/powershell-native/nativemsh/pwrshcommon/pwrshcommon.cpp
@@ -871,6 +871,7 @@ namespace NativeMsh
         "System.Web",
         "System.Web.HttpUtility",
         "System.Windows",
+        "System.Windows.Forms",
         "System.Xml",
         "System.Xml.Linq",
         "System.Xml.ReaderWriter",