diff --git a/modules/setup/library/Setup/Utils/DbTool.php b/modules/setup/library/Setup/Utils/DbTool.php
index ebfa08a0b..b08f42bf8 100644
--- a/modules/setup/library/Setup/Utils/DbTool.php
+++ b/modules/setup/library/Setup/Utils/DbTool.php
@@ -786,6 +786,6 @@ EOD;
             $privilegesGranted &= $query->fetchColumn() !== false;
         }
 
-        return $privilegesGranted;
+        return (bool) $privilegesGranted;
     }
 }