diff --git a/reference/mysqlnd_qc/quickstart.xml b/reference/mysqlnd_qc/quickstart.xml
index 8f3615c1a1..1e55637ad0 100644
--- a/reference/mysqlnd_qc/quickstart.xml
+++ b/reference/mysqlnd_qc/quickstart.xml
@@ -661,7 +661,7 @@ Script runtime  : 3 seconds
   </para>
  </section>
 
- <section xml:id="mysqlnd-qc.pattern_based_caching" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <section xml:id="mysqlnd-qc.pattern-based-caching" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Pattern based caching</title>
   <para>
    An application has three options for telling PECL/mysqlnd_qc whether a particular
@@ -830,7 +830,7 @@ mysqlnd_qc.slam_defense_ttl=1
   </para>
  </section>
 
- <section xml:id="mysqlnd-qc.cache_candidates" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <section xml:id="mysqlnd-qc.cache-candidates" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Finding cache candidates</title>
   <para>
    A statement should be considered for caching if it is executed often and has
@@ -988,7 +988,7 @@ foreach ($summary as $query => $details) {
   </para>
  </section>
 
- <section xml:id="mysqlnd-qc.cache_efficiency" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <section xml:id="mysqlnd-qc.cache-efficiency" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Measuring cache efficiency</title>
   <para>
    PECL/mysqlnd_qc offers three ways to measure the cache efficiency.