diff --git a/ch06.asciidoc b/ch06.asciidoc
index 17c0ac53..d12bb2f5 100644
--- a/ch06.asciidoc
+++ b/ch06.asciidoc
@@ -521,11 +521,7 @@ A digital signature is a _mathematical scheme_ that consists of two parts. The f
 
 In bitcoin's implementation of the ECDSA algorithm, the "message" being signed is the transaction, or more accurately a hash of a specific subset of the data in the transaction (see <<sighash_types>>). The signing key is the user's private key. The result is the signature:
 
-latexmath:[
-\begin{equation}
-(Sig = F_sig(F_hash(m), dA\)
-\end{equation}
-]
+latexmath:[\(Sig = F_sig(F_hash(m), dA\)]
 
 where: