diff --git a/chapter06/gmp.xml b/chapter06/gmp.xml
index f10c283b5..a16500a28 100644
--- a/chapter06/gmp.xml
+++ b/chapter06/gmp.xml
@@ -52,8 +52,9 @@
 
     <para>Prepare GMP for compilation:</para>
 
-<screen><userinput remap="configure">./configure --prefix=/usr --enable-cxx \
-    --docdir=/usr/share/doc/gmp-&gmp-version;</userinput></screen>
+<screen><userinput remap="configure">./configure --prefix=/usr \
+            --enable-cxx  \
+            --docdir=/usr/share/doc/gmp-&gmp-version;</userinput></screen>
 
     <variablelist>
       <title>The meaning of the new configure options:</title>