diff --git a/include/activscp.idl b/include/activscp.idl
index e539b04ccd6..57179cf52fa 100644
--- a/include/activscp.idl
+++ b/include/activscp.idl
@@ -45,7 +45,14 @@ cpp_quote("#define SCRIPTPROP_INVOKEVERSIONING       0x00004000")
 cpp_quote("#define SCRIPTPROP_HACK_FIBERSUPPORT                0x70000000")
 cpp_quote("#define SCRIPTPROP_HACK_TRIDENTEVENTSINK            0x70000001")
 cpp_quote("#define SCRIPTPROP_ABBREVIATE_GLOBALNAME_RESOLUTION 0x70000002")
- 
+
+typedef enum tagSCRIPTLANGUAGEVERSION {
+    SCRIPTLANGUAGEVERSION_DEFAULT = 0,
+    SCRIPTLANGUAGEVERSION_5_7     = 1,
+    SCRIPTLANGUAGEVERSION_5_8     = 2,
+    SCRIPTLANGUAGEVERSION_MAX     = 255
+} SCRIPTLANGUAGEVERSION;
+
 typedef enum tagSCRIPTSTATE {
     SCRIPTSTATE_UNINITIALIZED = 0,
     SCRIPTSTATE_STARTED       = 1,