index fa966cf8c30..44ce18d71a0 100644
--- a/x_/x_sfscript.nss
+++ b/x_/x_sfscript.nss
@@ -575,5 +575,6 @@ string GetResRefPrefix(string sResRef);
 string GetResRefErfPrefix(string sResRef);
 int GetResRefErfId(string sResRef);
 int GetResRefErfServers(string sResRef);
 void PrintToStdErr(string sPrint);
 void PrintToStdOut(string sPrint);
+int IsOnSinfarWorld();