diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 5a3a568..b4a58d4 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -333,7 +333,7 @@ function system_requirements($phase) {
     if (!empty($GLOBALS['config']['system.file']['path']['private'])) {
       $directories[] = $GLOBALS['config']['system.file']['path']['private'];
     }
-    if (!empty($GLOBALS['config']['system.file']['path.temporary'])) {
+    if (!empty($GLOBALS['config']['system.file']['path']['temporary'])) {
       $directories[] = $GLOBALS['config']['system.file']['path']['temporary'];
     }
     else {