diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 7c6ca09..b8872dc 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -2808,7 +2808,7 @@ class SchemaCache extends DrupalCacheArray {
 
   public function __construct() {
     // Cache by request method.
-    parent::__construct('schema:runtime:' . $_SERVER['REQUEST_METHOD'] == 'GET', 'cache');
+    parent::__construct('schema:runtime:' . ($_SERVER['REQUEST_METHOD'] == 'GET'), 'cache');
   }
 
   protected function resolveCacheMiss($offset) {