index 5075844ab7f..bc7328cf8ef 100644
--- a/x_/x_sfscript.nss
+++ b/x_/x_sfscript.nss
@@ -603,5 +603,6 @@ int GetCurrentActionParamType(object oObject, int nParam);
 int GetCurrentActionParamInt(object oObject, int nParam);
 float GetCurrentActionParamFloat(object oObject, int nParam);
 object GetCurrentActionParamObject(object oObject, int nParam);
 string GetCurrentActionParamString(object oObject, int nParam);
 location GetCurrentActionParamLocation(object oObject, int nParam);
+int IsValidPlayerScriptObject(object oObject);