diff --git a/chapter06/shadowpwd-exp.xml b/chapter06/shadowpwd-exp.xml
index 924769fff..3eb42756a 100644
--- a/chapter06/shadowpwd-exp.xml
+++ b/chapter06/shadowpwd-exp.xml
@@ -1,7 +1,7 @@
 <sect2>
 <title>Command explanations</title>
 
-<para><userinput>sed 's/\(.*\) (nflg || \(.*\)/\1\(\2/' useradd.c.temp
+<para><userinput>sed 's/\(.*\) (nflg || \(.*\))\(.*\)/\1\2\3/' useradd.c.temp
 &gt; src/useradd.c</userinput>: This sed is used to fix a compilation
 bug which occurs due to a variable being used but not defined.</para>
 
diff --git a/chapter06/shadowpwd-inst.xml b/chapter06/shadowpwd-inst.xml
index 3a3d59644..a0921ba07 100644
--- a/chapter06/shadowpwd-inst.xml
+++ b/chapter06/shadowpwd-inst.xml
@@ -5,7 +5,7 @@
 following commands:</para>
 
 <para><screen><userinput>mv src/useradd.c useradd.c.temp &amp;&amp;</userinput>
-<userinput>sed 's/\(.*\) (nflg || \(.*\)/\1\(\2/' useradd.c.temp &gt; src/useradd.c &amp;&amp;</userinput>
+<userinput>sed 's/\(.*\) (nflg || \(.*\))\(.*\)/\1\2\3/' useradd.c.temp &gt; src/useradd.c &amp;&amp;</userinput>
 <userinput>./configure --prefix=/usr &amp;&amp;</userinput>
 <userinput>make &amp;&amp;</userinput>
 <userinput>make install &amp;&amp;</userinput>