diff --git a/src/testdir/test83.in b/src/testdir/test83.in
index 300ddf1..09ef0b4 100644
--- a/src/testdir/test83.in
+++ b/src/testdir/test83.in
@@ -2,7 +2,7 @@
 
 STARTTEST
 :so mbyte.vim
-:if !has('iconv')
+:if !has('iconv') || iconv("\x82\x60", "cp932", "utf-8") != "\uff21"
 : e! test.ok
 : w! test.out
 : qa!