diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index ddff2266f9..c0ae5b917a 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -107,6 +107,7 @@
 		<li>[Fix] Correctly take post time instead of topic time for the overall forum feed statistics row. (Bug #55005)</li>
 		<li>[Fix] Posting errors with CAPTCHAs using user::add_lang(). (Bug #55245)</li>
 		<li>[Fix] Use memcache::replace() instead of memcache::set() for existing keys to prevent problems.</li>
+		<li>[Fix] Check for required functions in eAccelerator. (Bug #54465).</li>
 		<li>[Change] Send time of last item instead of current time in ATOM Feeds. (Bug #53305)</li>
 		<li>[Change] Use em dash instead of hyphen/minus as separator in ATOM Feeds item statistics. (Bug #53565)</li>
 	</ul>
diff --git a/phpBB/includes/acm/acm_eaccelerator.php b/phpBB/includes/acm/acm_eaccelerator.php
index 1a3cf3c0f7..645067c199 100644
--- a/phpBB/includes/acm/acm_eaccelerator.php
+++ b/phpBB/includes/acm/acm_eaccelerator.php
@@ -30,6 +30,7 @@ if (!class_exists('acm_memory'))
 class acm extends acm_memory
 {
 	var $extension = 'eaccelerator';
+	var $function = 'eaccelerator_get';
 
 	var $serialize_header = '#phpbb-serialized#';
 
diff --git a/phpBB/includes/acm/acm_memory.php b/phpBB/includes/acm/acm_memory.php
index 1ed4fb0d55..e315e979e5 100644
--- a/phpBB/includes/acm/acm_memory.php
+++ b/phpBB/includes/acm/acm_memory.php
@@ -47,6 +47,11 @@ class acm_memory
 
 			trigger_error("Could not find required extension [{$this->extension}] for the ACM module $acm_type.", E_USER_ERROR);
 		}
+
+		if (isset($this->function) && !function_exists($this->function))
+		{
+			trigger_error("The required function [{$this->function}] is not available for the ACM module $acm_type.", E_USER_ERROR);
+		}
 	}
 
 	/**