diff --git a/ch07_authorization-authentication.adoc b/ch07_authorization-authentication.adoc
index e6afe4dd..4a244734 100644
--- a/ch07_authorization-authentication.adoc
+++ b/ch07_authorization-authentication.adoc
@@ -1583,7 +1583,7 @@ transaction fees.
 [[mast]]
 === Merklized Alternative Script Trees (MAST)
 
-Using +OP_IF+, you ((("scripts", "MAST", id="script-mast")))((("MAST (merklized alternative script trees)", id="mast")))((("merkle trees", "MAST", id="merkle-tree-mast")))can authorize multiple different spending conditions,
+Using +OP_IF+, you ((("scripts", "MAST", id="script-mast")))((("MAST (merklized alternative script trees)", id="mast-ch7")))((("merkle trees", "MAST", id="merkle-tree-mast")))can authorize multiple different spending conditions,
 but this approach has several undesirable aspects:
 
 Weight (cost)::
@@ -1719,7 +1719,7 @@ image::images/mbc3_0709.png["An alternative script tree"]
 Alternative script trees only require revealing one 32-byte digest for
 each level of depth between the spender's chosen script and the root of
 the tree.  For most scripts, this is a much more efficient use of space
-in the((("scripts", "MAST", startref="script-mast")))((("MAST (merklized alternative script trees)", startref="mast")))((("merkle trees", "MAST", startref="merkle-tree-mast"))) blockchain.
+in the((("scripts", "MAST", startref="script-mast")))((("MAST (merklized alternative script trees)", startref="mast-ch7")))((("merkle trees", "MAST", startref="merkle-tree-mast"))) blockchain.
 ****
 
 [[pay_to_contract]]