diff --git a/en_US.ISO8859-1/books/fdp-primer/docbook-markup/chapter.xml b/en_US.ISO8859-1/books/fdp-primer/docbook-markup/chapter.xml
index 217ff33c7a..3c11353798 100644
--- a/en_US.ISO8859-1/books/fdp-primer/docbook-markup/chapter.xml
+++ b/en_US.ISO8859-1/books/fdp-primer/docbook-markup/chapter.xml
@@ -1104,6 +1104,7 @@ int
 main(void)
 {
     printf("hello, world\n");
+    return 0;
 }<tag class="endtag">programlisting</tag></programlisting>
 
 	<para>Notice how the angle brackets in the
@@ -1120,6 +1121,7 @@ int
 main(void)
 {
     printf("hello, world\n");
+    return 0;
 }</programlisting>
       </example>
     </sect2>
@@ -1150,6 +1152,7 @@ int <tag class="emptytag">co xml:id="co-ex-return"</tag>
 main(void)
 {
     printf("hello, world\n"); <tag class="emptytag">co xml:id="co-ex-printf"</tag>
+    return 0;
 }<tag class="endtag">programlisting</tag>
 
 <tag class="starttag">calloutlist</tag>
@@ -1178,6 +1181,7 @@ int <co xml:id="co-ex-return"/>
 main(void)
 {
     printf("hello, world\n"); <co xml:id="co-ex-printf"/>
+    return 0;
 }</programlisting>
 
 	<calloutlist>