diff --git a/TestSuite/explicitinterface11.pas b/TestSuite/explicitinterface11.pas
index 95efef25c..85a063430 100644
--- a/TestSuite/explicitinterface11.pas
+++ b/TestSuite/explicitinterface11.pas
@@ -1,4 +1,5 @@
-type
+//winonly
+type
   I1 = interface
     property X: integer read write;
   end;