diff --git a/admin_manual/installation/server_tuning.rst b/admin_manual/installation/server_tuning.rst
index a9da05467cc..1714a573ef6 100644
--- a/admin_manual/installation/server_tuning.rst
+++ b/admin_manual/installation/server_tuning.rst
@@ -149,7 +149,7 @@ should allow more processes to run in parallel to handle requests.
 Enable PHP OPcache
 ------------------
 
-The `OPcache <https://php.net/manual/en/intro.opcache.php>`_ improves the performance of PHP applications by caching precompiled bytecode.
+The `OPcache <https://www.php.net/manual/en/book.opcache.php>`_ improves the performance of PHP applications by caching precompiled bytecode.
 
 Revalidation
 ^^^^^^^^^^^^