diff --git a/index.php b/index.php
index 3cecb5c8b6..387b642e2c 100644
--- a/index.php
+++ b/index.php
@@ -55,7 +55,7 @@ if (file_exists($actionfile)) {
 
     $action_obj = new $action_class();
 
-    if ($config['db']['mirror'] && $action_obj->is_readonly()) {
+    if ($config['db']['mirror'] && $action_obj->isReadOnly()) {
         if (is_array($config['db']['mirror'])) {
             // "load balancing", ha ha
             $k = array_rand($config['db']['mirror']);
diff --git a/lib/action.php b/lib/action.php
index 207be3c824..2a8f5677c5 100644
--- a/lib/action.php
+++ b/lib/action.php
@@ -460,7 +460,7 @@ class Action extends HTMLOutputter // lawsuit
         return null;
     }
 
-    function is_readonly()
+    function isReadOnly()
     {
         return false;
     }