diff --git a/ch04_keys.adoc b/ch04_keys.adoc
index 4b1d2e5e..be604b31 100644
--- a/ch04_keys.adoc
+++ b/ch04_keys.adoc
@@ -882,7 +882,7 @@ signature.  In <<addresses_for_p2pkh>>, an appropriate public key also needed to
 provided.
 
 ++++
-<p class="fix_tracking">
+<p class="fix_tracking3">
 For a spender (like Alice) to place the constraints Bob wants
 in the output script she uses to pay him, Bob needs to communicate those
 constraints to her.  This is similar to the problem of Bob needing to