diff --git a/TestSuite/property4.pas b/TestSuite/property4.pas
index d4ce7712f..79573e6be 100644
--- a/TestSuite/property4.pas
+++ b/TestSuite/property4.pas
@@ -1,3 +1,4 @@
+//winonly
 {$reference 'PresentationFramework.dll'}
 {$reference 'WindowsBase.dll'}
 {$reference 'PresentationCore.dll'}