diff --git a/ch04.asciidoc b/ch04.asciidoc
index 9027b8c9..88ff8b80 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -343,7 +343,7 @@ Here's the same key, encoded in WIF and WIF-compressed formats
 |Format | Private Key
 | Hex | 1e99423a4ed27608a15a2616a2b0e9e52ced330ac530edcc32c8ffc6a526aedd
 | WIF | 5J3mBbAH58CpQ3Y5RNJpUKPE62SQ5tfcvU2JpbnkeyhfsYB1Jcn
-| Hex-compressed | 1e99423a4ed27608a15a2616a2b0e9e52ced330ac530edcc32c8ffc6a526aedd*01*
+| Hex-compressed | 1e99423a4ed27608a15a2616a2b0e9e52ced330ac530edcc32c8ffc6a526aedd_01_
 | WIF-compressed | KxFC1jmwwCoACiCAWZ3eXa96mBM6tb3TYzGmf6YwgdGWZgawvrtJ
 |=======