diff --git a/src/Illuminate/Http/Middleware/Cache.php b/src/Illuminate/Http/Middleware/Cache.php
index 9af851365656..2910cdca5bbd 100644
--- a/src/Illuminate/Http/Middleware/Cache.php
+++ b/src/Illuminate/Http/Middleware/Cache.php
@@ -35,7 +35,7 @@ public function handle($request, Closure $next, $options = [])
             $options = $parsedOptions;
         }
 
-        if (true === ($options['etag'] ?? false)) {
+        if (isset($options['etag']) && true === $options['etag']) {
             $options['etag'] = md5($response->getContent());
         }