diff --git a/admin_manual/installation/server_tuning.rst b/admin_manual/installation/server_tuning.rst
index 8cb3ac2c439..ef11cbf5cfb 100644
--- a/admin_manual/installation/server_tuning.rst
+++ b/admin_manual/installation/server_tuning.rst
@@ -128,7 +128,7 @@ more processes to run in parallel to handle the 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
 ^^^^^^^^^^^^