diff --git a/chapter06/glibc.xml b/chapter06/glibc.xml
index 6fc12efb8..05eff9cc4 100644
--- a/chapter06/glibc.xml
+++ b/chapter06/glibc.xml
@@ -49,7 +49,7 @@ of achieving a clean build.</para>
 threading libraries installed by Glibc.  Unpack the tarball from
 within the Glibc source directory:</para>
 
-<screen><userinput>tar xjvf /sources/glibc-linuxthreads-&glibc-version;.tar.bz2</userinput></screen>
+<screen><userinput>tar -xjvf /sources/glibc-linuxthreads-&glibc-version;.tar.bz2</userinput></screen>
 
 <para>The Glibc documentation recommends building Glibc outside of the source
 directory in a dedicated build directory:</para>