diff --git a/ch09_fees.adoc b/ch09_fees.adoc
index 6eedacb1..c357473f 100644
--- a/ch09_fees.adoc
+++ b/ch09_fees.adoc
@@ -513,7 +513,7 @@ Additionally, a transaction and all of its descendants is not
   that transaction is mined--none of those transactions can now be
   confirmed unless there's a rare blockchain reorganization.  Bitcoin
   Core will remove from its mempool every transaction that can no longer
-  be confirmed on the current blockchain.  At it's worst, that can
+  be confirmed on the current blockchain.  At its worst, that can
   waste an enormous amount of your node's bandwidth and possibly be used
   to prevent transactions from propagating correctly.
 +