diff --git a/ch04.asciidoc b/ch04.asciidoc
index 002567cb..64e62fb8 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -1,4 +1,4 @@
-	[[ch04_keys_addresses_wallets]]
+[[ch04_keys_addresses_wallets]]
 == Keys, Addresses, Wallets
 
 === Introduction