diff --git a/inc/functions.php b/inc/functions.php
index b80e2c63..1ff9768a 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -1693,7 +1693,7 @@ function buildIndex($global_api = "yes") {
 			// Tries to avoid rebuilding if the body is the same as the one in cache.
 			if ($config['cache']['enabled']) {
 				$contentHash = md5(json_encode($content['body']));
-				$contentHashKey = '_index_hashed_'. $board . '_' . $page;
+				$contentHashKey = '_index_hashed_'. $board['uri'] . '_' . $page;
 				$cachedHash = cache::get($contentHashKey);
 				if ($cachedHash == $contentHash){
 					if ($config['api']['enabled']) {